Update references to GerritJenkinsGit wiki

We've moved the GerritJenkinsGithub wiki page to instead be
at GerritJenkinsGit, update references to it in our configs.

Change-Id: I88d8140a0e5f6e4051ca78415e0152c9cdcb86f6

doc/source/gerrit.rst

@@ -7,8 +7,8 @@ Gerrit
 
 Gerrit is the code review system used by the OpenStack project.  For a
 full description of how the system fits into the OpenStack workflow,
-see `the GerritJenkinsGithub wiki article
-<https://wiki.openstack.org/wiki/GerritJenkinsGithub>`_.
+see `the GerritJenkinsGit wiki article
+<https://wiki.openstack.org/wiki/GerritJenkinsGit>`_.
 
 This section describes how Gerrit is configured for use in the
 OpenStack project and the tools used to manage that configuration.

modules/openstack_project/files/zuul/layout.yaml

@@ -4,7 +4,7 @@ includes:
 pipelines:
   - name: check
     description: Newly uploaded patchsets enter this pipeline to receive an initial +/-1 Verified vote from Jenkins.
-    failure-message: Build failed.  For information on how to proceed, see https://wiki.openstack.org/wiki/GerritJenkinsGithub#Test_Failures
+    failure-message: Build failed.  For information on how to proceed, see https://wiki.openstack.org/wiki/GerritJenkinsGit#Test_Failures
     manager: IndependentPipelineManager
     precedence: low
     trigger:
@@ -19,7 +19,7 @@ pipelines:
 
   - name: gate
     description: Changes that have been approved by core developers are enqueued in order in this pipeline, and if they pass tests in Jenkins, will be merged.
-    failure-message: Build failed.  For information on how to proceed, see https://wiki.openstack.org/wiki/GerritJenkinsGithub#Test_Failures
+    failure-message: Build failed.  For information on how to proceed, see https://wiki.openstack.org/wiki/GerritJenkinsGit#Test_Failures
     manager: DependentPipelineManager
     precedence: high
     trigger: