examples/client/telepathy-example-inspect-cm in telepathy-glib now does what you want - its output is not machine-readable, but I don't think that matters, since anyone wanting to inspect CMs programmatically should just use TpConnectionManager directly. The output for my versions of Gabble and Salut:

smcv@carbon% ./examples/client/telepathy-example-inspect-cm gabble
** Message: Connection manager name: gabble
** Message: Is running: no
** Message: Source of information: .manager file
** Message: Protocol: jabber
** Message: 	Can register accounts via Telepathy: yes
** Message: 	Parameter: account
** Message: 		D-Bus signature: s
** Message: 		Is required: yes
** Message: 		Is required for registration: yes
** Message: 		Is secret (password etc.): no
** Message: 		Is a D-Bus property: no
** Message: 		No default value
** Message: 	Parameter: password
** Message: 		D-Bus signature: s
** Message: 		Is required: yes
** Message: 		Is required for registration: yes
** Message: 		Is secret (password etc.): yes
** Message: 		Is a D-Bus property: no
** Message: 		No default value
** Message: 	Parameter: server
** Message: 		D-Bus signature: s
** Message: 		Is required: no
** Message: 		Is required for registration: no
** Message: 		Is secret (password etc.): no
** Message: 		Is a D-Bus property: no
** Message: 		No default value
** Message: 	Parameter: resource
** Message: 		D-Bus signature: s
** Message: 		Is required: no
** Message: 		Is required for registration: no
** Message: 		Is secret (password etc.): no
** Message: 		Is a D-Bus property: no
** Message: 		Default value: "Telepathy"
** Message: 	Parameter: priority
** Message: 		D-Bus signature: n
** Message: 		Is required: no
** Message: 		Is required for registration: no
** Message: 		Is secret (password etc.): no
** Message: 		Is a D-Bus property: no
** Message: 		Default value: 0
** Message: 	Parameter: port
** Message: 		D-Bus signature: q
** Message: 		Is required: no
** Message: 		Is required for registration: no
** Message: 		Is secret (password etc.): no
** Message: 		Is a D-Bus property: no
** Message: 		No default value
** Message: 	Parameter: old-ssl
** Message: 		D-Bus signature: b
** Message: 		Is required: no
** Message: 		Is required for registration: no
** Message: 		Is secret (password etc.): no
** Message: 		Is a D-Bus property: no
** Message: 		Default value: FALSE
** Message: 	Parameter: require-encryption
** Message: 		D-Bus signature: b
** Message: 		Is required: no
** Message: 		Is required for registration: no
** Message: 		Is secret (password etc.): no
** Message: 		Is a D-Bus property: no
** Message: 		Default value: FALSE
** Message: 	Parameter: register
** Message: 		D-Bus signature: b
** Message: 		Is required: no
** Message: 		Is required for registration: no
** Message: 		Is secret (password etc.): no
** Message: 		Is a D-Bus property: no
** Message: 		Default value: FALSE
** Message: 	Parameter: low-bandwidth
** Message: 		D-Bus signature: b
** Message: 		Is required: no
** Message: 		Is required for registration: no
** Message: 		Is secret (password etc.): no
** Message: 		Is a D-Bus property: no
** Message: 		Default value: FALSE
** Message: 	Parameter: https-proxy-server
** Message: 		D-Bus signature: s
** Message: 		Is required: no
** Message: 		Is required for registration: no
** Message: 		Is secret (password etc.): no
** Message: 		Is a D-Bus property: no
** Message: 		No default value
** Message: 	Parameter: https-proxy-port
** Message: 		D-Bus signature: q
** Message: 		Is required: no
** Message: 		Is required for registration: no
** Message: 		Is secret (password etc.): no
** Message: 		Is a D-Bus property: no
** Message: 		Default value: 443
** Message: 	Parameter: fallback-conference-server
** Message: 		D-Bus signature: s
** Message: 		Is required: no
** Message: 		Is required for registration: no
** Message: 		Is secret (password etc.): no
** Message: 		Is a D-Bus property: no
** Message: 		No default value
** Message: 	Parameter: stun-server
** Message: 		D-Bus signature: s
** Message: 		Is required: no
** Message: 		Is required for registration: no
** Message: 		Is secret (password etc.): no
** Message: 		Is a D-Bus property: no
** Message: 		No default value
** Message: 	Parameter: stun-port
** Message: 		D-Bus signature: q
** Message: 		Is required: no
** Message: 		Is required for registration: no
** Message: 		Is secret (password etc.): no
** Message: 		Is a D-Bus property: no
** Message: 		Default value: 3478
** Message: 	Parameter: ignore-ssl-errors
** Message: 		D-Bus signature: b
** Message: 		Is required: no
** Message: 		Is required for registration: no
** Message: 		Is secret (password etc.): no
** Message: 		Is a D-Bus property: no
** Message: 		Default value: FALSE
** Message: 	Parameter: alias
** Message: 		D-Bus signature: s
** Message: 		Is required: no
** Message: 		Is required for registration: no
** Message: 		Is secret (password etc.): no
** Message: 		Is a D-Bus property: no
** Message: 		No default value

smcv@carbon% ./examples/client/telepathy-example-inspect-cm salut
** Message: Connection manager name: salut
** Message: Is running: no
** Message: Source of information: .manager file
** Message: Protocol: local-xmpp
** Message:     Can register accounts via Telepathy: no
** Message:     Parameter: nickname
** Message:             D-Bus signature: s
** Message:             Is required: no
** Message:             Is secret (password etc.): no
** Message:             Is a D-Bus property: no
** Message:             No default value
** Message:     Parameter: first-name
** Message:             D-Bus signature: s
** Message:             Is required: yes
** Message:             Is secret (password etc.): no
** Message:             Is a D-Bus property: no
** Message:             No default value
** Message:     Parameter: last-name
** Message:             D-Bus signature: s
** Message:             Is required: yes
** Message:             Is secret (password etc.): no
** Message:             Is a D-Bus property: no
** Message: 		No default value
** Message: 	Parameter: jid
** Message: 		D-Bus signature: s
** Message: 		Is required: no
** Message: 		Is secret (password etc.): no
** Message: 		Is a D-Bus property: no
** Message: 		No default value
** Message: 	Parameter: email
** Message: 		D-Bus signature: s
** Message: 		Is required: no
** Message: 		Is secret (password etc.): no
** Message: 		Is a D-Bus property: no
** Message: 		No default value
** Message: 	Parameter: published-name
** Message: 		D-Bus signature: s
** Message: 		Is required: no
** Message: 		Is secret (password etc.): no
** Message: 		Is a D-Bus property: no
** Message: 		No default value

Connection manager parameter documentation can be put online in various ways. The simplest would be for wiki pages to link to the canonical source of the parameters in the CM's source code (which I'm about to change to be a blob of Python), or for the `make maintainer-upload-release` target to upload either the .manager file or a more human-readable version somewhere that the wiki can reference.

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