Merge branch 'nd/pathspec-recursion-cleanup'

* nd/pathspec-recursion-cleanup:
  diff-index: enable recursive pathspec matching in unpack_trees
  Document limited recursion pathspec matching with wildcards

Documentation/git-grep.txt

@@ -79,6 +79,9 @@ OPTIONS
 --max-depth <depth>::
 	For each <pathspec> given on command line, descend at most <depth>
 	levels of directories. A negative value means no limit.
+	This option is ignored if <pathspec> contains active wildcards.
+	In other words if "a*" matches a directory named "a*",
+	"*" is matched literally so --max-depth is still effective.
 
 -w::
 --word-regexp::