Merge branch 'll/doc-mktree-typofix'

Typofix.

* ll/doc-mktree-typofix:
  fix typo in git-mktree.txt

Author: gitster

Documentation/git-mktree.txt

@@ -31,7 +31,7 @@ OPTIONS
 
 --batch::
 	Allow building of more than one tree object before exiting.  Each
-	tree is separated by as single blank line. The final new-line is
+	tree is separated by a single blank line. The final new-line is
 	optional.  Note - if the `-z` option is used, lines are terminated
 	with NUL.