doc: Drop tripleoclient

The TripleO project has been deprecated and its master is no longer
maintained. The complete project retirement is now on-going.

Change-Id: If7b390fc2230c16ef138ceb4a7bc5d97dcf790e6

Author: kajinamit

doc/source/cli/plugin-commands/index.rst

@@ -42,8 +42,3 @@ Plugin Commands
 .. # the murano docs cause warnings and a broken docs build
 .. # .. list-plugins:: openstack.application_catalog.v1
 .. #   :detailed:
-
-.. tripleo
-.. # tripleoclient is not in global-requirements
-.. # list-plugins:: openstack.tripleoclient.v1
-.. #   :detailed:

doc/source/contributor/plugins.rst

@@ -33,20 +33,17 @@ The following is a list of projects that are an OpenStackClient plugin.
 - python-ironic-inspector-client
 - python-mistralclient
 - python-muranoclient
-- python-neutronclient\*\*\*
+- python-neutronclient\*\*
 - python-octaviaclient
 - python-rsdclient
 - python-saharaclient
 - python-senlinclient
-- python-tripleoclient\*\*
 - python-troveclient
 - python-watcherclient
 - python-zaqarclient
 - python-zunclient
 
-\*\* Note that some clients are not listed in global-requirements.
-
-\*\*\* Project contains advanced network services.
+\*\* Project contains advanced network services.
 
 The following is a list of projects that are not an OpenStackClient plugin.