http://telepathy.freedesktop.org/spec/errors.html doesn't actually include the DBus error names of each error, but only includes strings like "Encryption Not Available".
Fixed in my branch include-error-names <http://git.collabora.co.uk/?p=user/wjt/telepathy-spec-wjt.git;a=shortlog;h=refs/heads/include-error-names> which includes another fix to make `make upload-branch` actually upload the new-style output. The new output is visible at <http://people.freedesktop.org/~wjt/telepathy-spec-include_error_names/spec/errors.html>.
Fixed in git, will be in 0.17.23
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