Remove "Submitted, Merge Pending" from review UI documentation

This state no longer exists.  Remove it from the UI documentation.

Change-Id: Ic59e6b58f3fe176e0f4fe4f6ae52e67ae996ea34
diff --git a/Documentation/user-review-ui.txt b/Documentation/user-review-ui.txt
index 1015e0f..80b14eb 100644
--- a/Documentation/user-review-ui.txt
+++ b/Documentation/user-review-ui.txt
@@ -53,18 +53,6 @@
 +
 The change has all necessary approvals and may be submitted.
 
-- [[submitted-merge-pending]]`Submitted, Merge Pending`:
-+
-The change was submitted and was added to the merge queue.
-+
-The change stays in the merge queue if it depends on a change that is
-still in review. In this case it will get automatically merged when all
-dependency changes have been merged.
-+
-This status can also mean that the change depends on an abandoned
-change or on an outdated patch set of another change. In this case you
-may want to rebase the change.
-
 - [[merged]]`Merged`:
 +
 The change was successfully merged into the destination branch.