Update draft release notes for 1.6.2.1

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

Documentation/RelNotes-1.6.2.1.txt

@@ -4,3 +4,22 @@ GIT v1.6.2.1 Release Notes
 Fixes since v1.6.2
 ------------------
 
+* .gitignore learned to handle backslash as a quoting mechanism for
+  comment introduction character "#".
+
+* timestamp output in --date=relative mode used to display timestamps that
+  are long time ago in the default mode; it now uses "N years M months
+  ago", and "N years ago".
+
+* git-add -i/-p now works with non-ASCII pathnames.
+
+* "git hash-object -w" did not read from the configuration file from the
+  correct .git directory.
+
+* git-send-email learned to correctly handle multiple Cc: addresses.
+
+---
+exec >/var/tmp/1
+O=v1.6.2-21-g7681ed2
+echo O=$(git describe maint)
+git shortlog --no-merges $O..maint