Update draft release notes to 1.8.4

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

Documentation/RelNotes/1.8.4.txt

@@ -45,6 +45,9 @@ UI, Workflows & Features
    thing after you set "user.name/email" to introduce yourselves to
    Git.  Now the variable defaults to "auto".
 
+ * On Cygwin, "cygstart" is now recognised as a possible way to start
+   a web browser (used in "help -w" and "instaweb" among others).
+
 ### * "git status" learned status.branch and status.short configuration
 ###   variables to use --branch and --short options by default (override
 ###   with --no-branch and --no-short options from the command line).
@@ -154,6 +157,15 @@ Unless otherwise noted, all the fixes since v1.8.3 in the maintenance
 track are contained in this release (see release notes to them for
 details).
 
+ * "git apply" parsed patches that add new files, generated by
+   programs other than Git, incorrectly.  This is an old breakage in
+   v1.7.11 and will need to be merged down to the maintanance tracks.
+   (merge 212eb96 tr/maint-apply-non-git-patch-parsefix later to maint).
+
+ * Many "git submodule" operations do not work on a submodule at a
+   path whose name is not in ASCII.
+   (merge bed9470 fg/submodule-non-ascii-path later to maint).
+
  * "cherry-pick" had a small leak in an error codepath.
    (merge 706728a fc/sequencer-plug-leak later to maint).