Documentation: add missing second colons and remove a typo

It takes two colons to mark text as item label.

Signed-off-by: Rene Scharfe <rene.scharfe@lsrfire.ath.cx>
Signed-off-by: Junio C Hamano <junkio@cox.net>

Documentation/git-http-push.txt

@@ -34,7 +34,7 @@ OPTIONS
 	Report the list of objects being walked locally and the
 	list of objects successfully sent to the remote repository.
 
-<ref>...:
+<ref>...::
 	The remote refs to update.
 
 

Documentation/git-send-pack.txt

@@ -43,7 +43,7 @@ OPTIONS
 <directory>::
 	The repository to update.
 
-<ref>...:
+<ref>...::
 	The remote refs to update.
 
 

Documentation/git-shortlog.txt

@@ -27,8 +27,8 @@ OPTIONS
 	Sort output according to the number of commits per author instead
 	of author alphabetic order.
 
--s:
-	Supress commit description and Provide a commit count summary only.
+-s::
+	Supress commit description and provide a commit count summary only.
 
 FILES
 -----

Documentation/glossary.txt

@@ -179,7 +179,7 @@ object name::
 	character hexadecimal encoding of the hash of the object (possibly
 	followed by a white space).
 
-object type:
+object type::
 	One of the identifiers "commit","tree","tag" and "blob" describing
 	the type of an object.
 
@@ -324,7 +324,7 @@ tag::
 	A tag is most typically used to mark a particular point in the
 	commit ancestry chain.
 
-unmerged index:
+unmerged index::
 	An index which contains unmerged index entries.
 
 working tree::