Fix description of 'status:abandoned' query operator

The description claimed that the change was either abandoned by the
change owner or an administrator.

Commit 029c85aa8262f7271e9bd121356879c5ae95c0a7 introduced a new access
right for abandoning changes, so that the changes found by
'status:abandoned' also may have been abandoned by a user with this
access right. Instead of listing everybody who can abandon a change,
simply remove this info from the search documentation. Also for other
operators it is not mentioned who was doing the operation to bring the
change into this state.

Change-Id: I5f28601bcc641777d5f205675611fb777d5d4bdc
Signed-off-by: Edwin Kempin <edwin.kempin@sap.com>
diff --git a/Documentation/user-search.txt b/Documentation/user-search.txt
index f5c0a01..8a231fe 100644
--- a/Documentation/user-search.txt
+++ b/Documentation/user-search.txt
@@ -268,7 +268,7 @@
 
 status:abandoned::
 +
-Change has been abandoned by the change owner, or an administrator.
+Change has been abandoned.
 
 
 Boolean Operators