Update release notes for Gerrit 2.5.2

Describe two more fixes that were merged lately.

Change-Id: Ia3cbe48e2e578beb92f5d5835403931d1e541893
Signed-off-by: Edwin Kempin <edwin.kempin@sap.com>
diff --git a/ReleaseNotes/ReleaseNotes-2.5.2.txt b/ReleaseNotes/ReleaseNotes-2.5.2.txt
index 76d36d8..5e99ebf 100644
--- a/ReleaseNotes/ReleaseNotes-2.5.2.txt
+++ b/ReleaseNotes/ReleaseNotes-2.5.2.txt
@@ -20,6 +20,12 @@
 or 'refs/tags/' into the RevWalk is now avoided, which improves the
 performance.
 
+* Improve Push performance by discarding 'cache-automerge/*' refs
+  early in VisibleRefFilter
++
+For a typical large Git repository, with many refs and lots of cached
+merges, the push time goes down significantly.
+
 * Don't display all files from a merge-commit when auto-merge fails
 +
 For merge commits Gerrit shows the difference to the automatic merge
@@ -51,6 +57,32 @@
 set in the WebUI, and which was contained in the patchset-created
 event, was invalid.
 
+* link:http://code.google.com/p/gerrit/issues/detail?id=1767[issue 1767]:
+  Remove wrong error message when pushing a new ref fails
++
+If pushing a new ref was rejected because the user was not allowed to
+create it the error message always told the user that he's missing the
+'Create Reference' access right. This message was incorrect in some
+cases. Users that have the 'Create Reference' access right assigned
+are e.g. not allowed to create the ref if:
++
+--
+** they are pushing an annotated tag without having the
+   'Push Annotated Tag' access right
+** they are pushing a signed tag without having the 'Push Signed Tag'
+   access right
+** the project state is set to 'Read Only'
+--
++
+Now the error message just says 'Prohibited by Gerrit'. This generic
+error message is better than a more concrete error message which is
+wrong in same cases because a wrong message is misleading and
+confuses the user.
++
+In addition the description of the 'Prohibited by Gerrit' error in the
+documentation has been updated to explain some additional cases in
+which the 'Prohibited by Gerrit' error occurs.
+
 * link:http://code.google.com/p/gerrit/issues/detail?id=1444[issue 1444]:
   Remove 'Mailing-List' header from sent emails
 +