Mark 'Technical Writing' SIG complete as it is merged into TC

The Technical Writing SIG has served its purpose to provde
the guidance and tooling to have most of the documentation
ownership to projects. Now we do not have much work in this
SIG and it is also lacking maintainer to lead this SIG. The
current Chair Stephen Finucane would not be able to continue
leading this SIG.

In TC weekly meetings and PTG[1], we decided to merge this
SIG responsibility in TC (depends-on). SIG repos will be moved
to TC and a few repos which are related to upstream institute training
will be moved to First Contact SIG.

One repo 'training-labs' is left for now, which will be called
for the maintainer, and if there is no one, we can retire it.
We are not even sure who is using it. Upstream training and CoA
do not use this repo.

Depends-On: https://review.opendev.org/c/openstack/governance/+/815869

[1] https://etherpad.opendev.org/p/tc-yoga-ptg
    http://lists.openstack.org/pipermail/openstack-discuss/2021-October/025554.html

Change-Id: I5f2061e788346348b4f3ec375e9498a368c4ac47

completed-sigs.yaml

@@ -21,3 +21,21 @@ Upgrade:
     online 'rolling' upgrades. Therefore, we consider mission for Upgrade SIG
     is completed.
   url: https://wiki.openstack.org/wiki/Upgrade_SIG
+
+Technical Writing:
+  chairs:
+    - name: Stephen Finucane
+      irc: stephenfin
+      email: sfinucan@redhat.com
+  scope: >
+    The technical writing SIG provides guidance, assistance, tooling, and style
+    guides enabling OpenStack project teams to produce consistent, accurate,
+    and high-quality documentation.
+  url: https://wiki.openstack.org/wiki/Documentation
+  status: completed
+  reason: >
+    The technical writing SIG has provided the guidelines and tooling to move
+    the documentation ownership to the projects. Now we have significantly less
+    amount of work under this SIG and having fewer or maintainer for this SIG
+    in the Yoga cycle, we decided to merge this SIG into the Technical Committee.
+    Contact OpenStack Technical Committee for any query related to this SIG.

sigs.yaml

@@ -331,18 +331,6 @@ Security:
   status: active
   url: https://wiki.openstack.org/wiki/Security-SIG
 
-Technical Writing:
-  chairs:
-    - name: Stephen Finucane
-      irc: stephenfin
-      email: sfinucan@redhat.com
-  scope: >
-    The technical writing SIG provides guidance, assistance, tooling, and style
-    guides enabling OpenStack project teams to produce consistent, accurate,
-    and high-quality documentation.
-  url: https://wiki.openstack.org/wiki/Documentation
-  status: active
-
 Testing and Collaboration Tools:
   chairs:
     - name: Jeremy Stanley