Merge "Document the comment: search operator"

Documentation/user-search.txt

diff --git a/Documentation/user-search.txt b/Documentation/user-search.txt
index d7e9fd7..ffff50c6 100644
--- a/Documentation/user-search.txt
+++ b/Documentation/user-search.txt
@@ -168,6 +168,11 @@
 +
 Changes that match 'MESSAGE' arbitrary string in the commit message body.
 
+[[comment]]
+comment:'TEXT'::
++
+Changes that match 'TEXT' string in any comment left by a reviewer.
+
 [[file]]
 file:^'REGEX'::
 +