Sync with 1.9.3

diff --combined Documentation/git.txt
index 35eb677ce0a193ff670029daa8fd5b9caee0c8f7,dd2f0aa1fa2d7fcc8e6c6a7342082834d67c6f0f..a041cd006a5a32937fff7938d6396fc563b145c2
--- 1/Documentation/git.txt
--- 2/Documentation/git.txt
+++ b/Documentation/git.txt
@@@ -43,9 -43,10 +43,10 @@@ unreleased) version of Git, that is ava
  branch of the `git.git` repository.
  Documentation for older releases are available here:
  
- * link:v1.9.2/git.html[documentation for release 1.9.2]
+ * link:v1.9.3/git.html[documentation for release 1.9.3]
  
  * release notes for
+   link:RelNotes/1.9.3.txt[1.9.3],
    link:RelNotes/1.9.2.txt[1.9.2],
    link:RelNotes/1.9.1.txt[1.9.1],
    link:RelNotes/1.9.0.txt[1.9.0].
@@@ -722,11 -723,6 +723,11 @@@ Git so take care if using Cogito etc
        index file. If not specified, the default of `$GIT_DIR/index`
        is used.
  
 +'GIT_INDEX_VERSION'::
 +      This environment variable allows the specification of an index
 +      version for new repositories.  It won't affect existing index
 +      files.  By default index file version [23] is used.
 +
  'GIT_OBJECT_DIRECTORY'::
        If the object storage directory is specified via this
        environment variable then the sha1 directories are created