Merge branch 'js/rev-parse-doc-fix' into jch

By Jon Seymour
* js/rev-parse-doc-fix:
  rev-parse doc: --git-dir does not always show a relative path

Documentation/git-rev-parse.txt

@@ -137,7 +137,8 @@ shown.  If the pattern does not contain a globbing character (`?`,
 
 --git-dir::
 	Show `$GIT_DIR` if defined. Otherwise show the path to
-	the .git directory, relative to the current directory.
+	the .git directory. The path shown, when relative, is
+	relative to the current working directory.
 +
 If `$GIT_DIR` is not defined and the current directory
 is not detected to lie in a git repository or work tree