Update draft release notes for 2.0

Describe one last minute one-liner fix for regression introduced in
1.9, and fix a grave mischaracterization on a recent remote-hg/bzr
change, pointed out by Felipe.

Signed-off-by: Junio C Hamano <gitster@pobox.com>

Documentation/RelNotes/2.0.0.txt

@@ -89,8 +89,8 @@ UI, Workflows & Features
    "-h" (no header) and "-c" (count) options are given.
 
  * "git push" via transport-helper interface (e.g. remote-hg) has
-   been updated to allow ref deletion in a way similar to the natively
-   supported transports.
+   been updated to allow forced ref updates in a way similar to the
+   natively supported transports.
 
  * The "simple" mode is the default for "git push".
 
@@ -179,6 +179,10 @@ Unless otherwise noted, all the fixes since v1.9 in the maintenance
 track are contained in this release (see the maintenance releases'
 notes for details).
 
+ * "git p4" was broken in 1.9 release to deal with changes in binary
+   files.
+   (merge 749b668 cl/p4-use-diff-tree later to maint).
+
  * The shell prompt script (in contrib/), when using the PROMPT_COMMAND
    interface, used an unsafe construct when showing the branch name in
    $PS1.