Update docs.voltha.org release version matrix.

howot/release/repositories/
  o Document more caveats for releasing indivdiual repositories.
  o repo:ci-management must be released twice:
    - first to establish a branhc for pipeline jobs.
    - second to update dependent versions after downstream repos have been released

Change-Id: I33d7f2442a1d4ea45a48caef0e49df92988cc2ce
diff --git a/howto/release/repositories/go_mod_update.rst b/howto/release/repositories/go_mod_update.rst
new file mode 100644
index 0000000..c2dc1b7
--- /dev/null
+++ b/howto/release/repositories/go_mod_update.rst
@@ -0,0 +1 @@
+golang_gofmt_syntax.rst