Link to merge instructions in merge process doc

Change-Id: Icc3fe11ce8a36bb53d5da2289a40c879153f09ce
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2105684
Auto-Submit: Alan Cutter <[email protected]>
Reviewed-by: Glen Robertson <[email protected]>
Commit-Queue: Glen Robertson <[email protected]>
Cr-Commit-Position: refs/heads/master@{#879697}
diff --git a/docs/process/merge_request.md b/docs/process/merge_request.md
index e750053..bd87773 100644
--- a/docs/process/merge_request.md
+++ b/docs/process/merge_request.md
@@ -137,6 +137,9 @@
 **immediately after**. Please note that if change is not
 merged in time after approval, it can be rejected.
 
+To perform the merge see [How to merge a change to a release
+branch](https://www.chromium.org/developers/how-tos/drover).
+
 If merge is rejected, “Merge-Rejected” label will be
 applied. If you think it’s important to consider the
 change for merge and does not meet the criteria above,