docs/git-remote: capitalize first word of initial blurb

All other man files have capitalized descriptions which
immediately follow the command's name. Let's capitalize
this one too for consistency.

Signed-off-by: Albert L. Lash, IV <alash3@bloomberg.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Documentation/git-remote.txt

@@ -3,7 +3,7 @@ git-remote(1)
 
 NAME
 ----
-git-remote - manage set of tracked repositories
+git-remote - Manage set of tracked repositories
 
 
 SYNOPSIS