Add note to chromium cq config to get sign-off from chrome-eng-review per wiki.

infra/config/cq.cfg

Index: infra/config/cq.cfg
diff --git a/infra/config/cq.cfg b/infra/config/cq.cfg
index 1876b5a20d688501455fe93417172c3eeabc0c10..160a5042b5ec38876948058868fe8321598bc41b 100644
--- a/infra/config/cq.cfg
+++ b/infra/config/cq.cfg
@@ -22,6 +22,9 @@ verifiers {
     tree_status_url: "https://chromium-status.appspot.com"
   }
 
+# NOTE: when adding new configs to the commit queue, please contact
+# chrome-eng-review per
+# https://sites.google.com/a/chromium.org/dev/developers/testing/chromium-build-infrastructure/tour-of-the-chromium-buildbot?pli=1#TOC-Adding-new-build-configurations-and-tests-to-the-main-Chromium-waterfall-Commit-Queue
   try_job {
     buckets {
       name: "tryserver.chromium.linux"
@@ -80,5 +83,9 @@ verifiers {
     }
   }
 
+# NOTE: when adding new configs to the commit queue, please contact
+# chrome-eng-review per
+# https://sites.google.com/a/chromium.org/dev/developers/testing/chromium-build-infrastructure/tour-of-the-chromium-buildbot?pli=1#TOC-Adding-new-build-configurations-and-tests-to-the-main-Chromium-waterfall-Commit-Queue
+
   sign_cla {}
 }