Describe second batch for 1.7.0 in draft release notes

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

Documentation/RelNotes-1.7.0.txt

@@ -50,6 +50,12 @@ Updates since v1.6.6
 
 (usability, bells and whistles)
 
+ * "git commit --date='<date>'" can be used to override the author date
+   just like "git commit --author='<name> <email>'" can be used to
+   override the author identity.
+
+ * "git status" learned "-s(hort)" output format.
+
 
 Fixes since v1.6.6
 ------------------
@@ -59,6 +65,6 @@ release, unless otherwise noted.
 
 --
 exec >/var/tmp/1
-O=v1.6.6-27-g648f407
+O=v1.6.6-101-gf012d27
 echo O=$(git describe master)
 git shortlog --no-merges $O..master ^maint