[results feed] Change documentation of comment field in results feed

Change-Id: I8e6b2e687d0b5e9061f6589ad497002cf852d899
TBR: athom@google.com
Reviewed-on: https://dart-review.googlesource.com/c/dart_ci/+/143780
Reviewed-by: William Hesse <whesse@google.com>
diff --git a/results_feed/lib/src/components/commit_component.html b/results_feed/lib/src/components/commit_component.html
index 214f0cd..7304132 100644
--- a/results_feed/lib/src/components/commit_component.html
+++ b/results_feed/lib/src/components/commit_component.html
@@ -40,8 +40,10 @@
         failuresOnly></results-selector-panel>
   </div>
   <div *ngIf="approving" class="commit-bottom">
-    Comment: (type #4567 for GitHub SDK issue 4567,
-    or co19 #123 for a co19 issue. Use \n for newline.)<br>
+    Comment: Use GitHub short links like #456 (dart-lang sdk issue 456),
+    flutter/engine#93, or google/quiver-dart#45. You can also paste
+    URLs of GitHub issues in dart-lang, flutter, or google directly.
+    <br>
     <material-input
         multiline
         label="Comment"