Fix broken sentence in description of unchanged file marker

Change-Id: Ib7cb097606f53380886cf1ad3c09226778ec1918
Signed-off-by: Edwin Kempin <ekempin@google.com>
(cherry picked from commit c4eba0ed0e2016e4600659e30717beafbf8330c7)
diff --git a/Documentation/user-review-ui.txt b/Documentation/user-review-ui.txt
index 426e6ac..de17c00 100644
--- a/Documentation/user-review-ui.txt
+++ b/Documentation/user-review-ui.txt
@@ -331,7 +331,8 @@
 +
 The file is unchanged and has the same content. Unchanged files only
 appear in the file list if 2 patch sets are compared and the file has
-comments one of the sides. Otherwise unchanged files are filtered out.
+comments on at least one of the sides. Otherwise unchanged files are
+filtered out.
 
 image::images/user-review-ui-change-screen-file-list-modification-type.png[width=800, link="images/user-review-ui-change-screen-file-list-modification-type.png"]