chenxing 4f89dd521d doc: Start using openstackdoctheme's extlink extension
This ensures we have version-specific references to other projects [1].
Note that this doesn't mean the URLs are actually valid - we need to do
more work (linkcheck?) here, but it's an improvement nonetheless.

[1] https://docs.openstack.org/openstackdocstheme/latest/#external-link-helper

Change-Id: I118e4d211617c5df66ff04dc04e308a1d2fc67ad
(cherry picked from commit 31526d4c26e924578cc13e5f1fce7c6907a256e3)
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