docs: add guidelines for abandoning patches

The code review guidelines have been updated to explain when
patches that do not receive a response to the review comments
will be abandoned.

Change-Id: I60539e16ca41245cf1b352f24557be1b3c67c367
Signed-off-by: Manish V Badarkhe <Manish.Badarkhe@arm.com>
diff --git a/docs/process/code-review-guidelines.rst b/docs/process/code-review-guidelines.rst
index ccdd110..bd42811 100644
--- a/docs/process/code-review-guidelines.rst
+++ b/docs/process/code-review-guidelines.rst
@@ -94,6 +94,14 @@
    directory to have the freedom to change it in any way. This way, your changes
    benefit everyone and will be maintained over time.
 
+-  It is the patch-author's responsibility to respond to review comments within
+   21 days. In the event that the patch-author does not respond within this
+   timeframe, the maintainer is entitled to abandon the patch(es).
+   Patch author(s) may be busy with other priorities, causing a delay in
+   responding to active review comments after posting patch(es). In such a
+   situation, if the author's patch(es) is/are abandoned, they can restore
+   their work for review by resolving comments, merge-conflicts, and revising
+   their original submissions.
 
 Guidelines for all reviewers
 ----------------------------