Remove checkniceness

We do not need this tox environment anymore, remove it.

Also, update documentation for jobs with Zuul v3.

Change-Id: I226835ad57af775a77e4719c5dcf7d13010ebd76

doc/doc-contrib-guide/source/docs-builds.rst

@@ -266,9 +266,9 @@ that do automatic testing of patches.
 
 The current jobs are:
 
-* gate-openstack-manuals-tox-checkniceness
-* gate-openstack-manuals-tox-doc-publish-checkbuild
-* gate-openstack-manuals-tox-checklang
+* openstack-tox-linters
+* build-tox-manual-checkbuild
+* build-tox-manual-checklang
 
 Checklang job
 -------------
@@ -283,11 +283,7 @@ the Security Guide, HA Guide and Install Guides.
   <https://bugs.launchpad.net/openstack-i18n>`_.
 
 If you want to manually run this check on your local workstation you can use
-the checklang environment (:command:`tox -e checklang`). To use this
-environment, you first have to install the *xml2po* utility on your local
-workstation. xml2po is part of the gnome-doc-utils and can be installed with
-:command:`yum install gnome-doc-utils` (on RedHat-based distributions), or
-:command:`zypper install xml2po` (on SUSE-based distributions).
+the checklang environment (:command:`tox -e checklang`).
 
 .. _docs_builds_eol:
 

tox.ini

@@ -22,11 +22,6 @@ commands = {posargs}
 commands =
   {toxinidir}/tools/build-all-rst.sh --linkcheck
 
-[testenv:checkniceness]
-# Replaced in CI with "linters" environment but kept here as a
-# backwards-compatibility shim for muscle memory.
-commands = {[testenv:linters]commands}
-
 [testenv:linters]
 commands =
   flake8