Sync with 2.1.2

* maint:
  Git 2.1.2

Documentation/RelNotes/2.1.2.txt

@@ -0,0 +1,20 @@
+Git v2.1.2 Release Notes
+========================
+
+ * "git push" over HTTP transport had an artificial limit on number of
+   refs that can be pushed imposed by the command line length.
+
+ * When receiving an invalid pack stream that records the same object
+   twice, multiple threads got confused due to a race.
+
+ * An attempt to remove the entire tree in the "git fast-import" input
+   stream caused it to misbehave.
+
+ * Reachability check (used in "git prune" and friends) did not add a
+   detached HEAD as a starting point to traverse objects still in use.
+
+ * "git config --add section.var val" used to lose existing
+   section.var whose value was an empty string.
+
+ * "git fsck" failed to report that it found corrupt objects via its
+   exit status in some cases.

Documentation/git.txt

@@ -43,9 +43,10 @@ unreleased) version of Git, that is available from the 'master'
 branch of the `git.git` repository.
 Documentation for older releases are available here:
 
-* link:v2.1.1/git.html[documentation for release 2.1.1]
+* link:v2.1.2/git.html[documentation for release 2.1.2]
 
 * release notes for
+  link:RelNotes/2.1.2.txt[2.1.2],
   link:RelNotes/2.1.1.txt[2.1.1],
   link:RelNotes/2.1.0.txt[2.1].