Merge branch 'vd/doc-unpack-objects' into maint

The synopsis section of "git unpack-objects" documentation has been
clarified a bit.

* vd/doc-unpack-objects:
  Documentation: "pack-file" is not literal in unpack-objects
  Documentation: restore a space in unpack-objects usage

Documentation/git-unpack-objects.txt

@@ -9,7 +9,7 @@ git-unpack-objects - Unpack objects from a packed archive
 SYNOPSIS
 --------
 [verse]
-'git unpack-objects' [-n] [-q] [-r] [--strict] <pack-file
+'git unpack-objects' [-n] [-q] [-r] [--strict] < <pack-file>
 
 
 DESCRIPTION