Documentation: "pack-file" is not literal in unpack-objects

Make it clear that "pack-file" is not to be spelled as is in the
unpack-objects usage.

Signed-off-by: Vivien Didelot <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: vivien

Documentation/git-unpack-objects.txt

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