Update CODEOWNERS
Updating CODEOWNERS to set docs team as reviewers for docs files.
This change was approved and merged to GDI specs in
* @keitwb @jcheng-splunk @mstumpfx @asuresh4 @jrcamp @rmfitzpatrick
+
+#####################################################
+#
+# Docs reviewers
+#
+#####################################################
+
+*.md @signalfx/docs
+*.rst @signalfx/docs
+docs/ @signalfx/docs
+README* @signalfx/docs @signalfx/gdi-specification-approvers @signalfx/gdi-specification-maintainers
