documentation: employ consistent verb tense for a list

Diff best viewed with --color-diff.

Signed-off-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Documentation/config/push.txt

@@ -35,7 +35,7 @@ push.default::
 
 * `tracking` - This is a deprecated synonym for `upstream`.
 
-* `simple` - pushes the current branch with the same name on the remote.
+* `simple` - push the current branch with the same name on the remote.
 +
 If you are working on a centralized workflow (pushing to the same repository you
 pull from, which is typically `origin`), then you need to configure an upstream

Documentation/config/receive.txt

@@ -14,7 +14,7 @@ receive.autogc::
 
 receive.certNonceSeed::
 	By setting this variable to a string, `git receive-pack`
-	will accept a `git push --signed` and verifies it by using
+	will accept a `git push --signed` and verify it by using
 	a "nonce" protected by HMAC using this string as a secret
 	key.
 

Documentation/git-rev-parse.txt

@@ -156,7 +156,7 @@ for another option.
 	are not refs (i.e. branch or tag names; or more
 	explicitly disambiguating "heads/master" form, when you
 	want to name the "master" branch when there is an
-	unfortunately named tag "master"), and show them as full
+	unfortunately named tag "master"), and shows them as full
 	refnames (e.g. "refs/heads/master").
 
 Options for Objects