doc/config: grammar fixes for core.{editor,commentChar}

Signed-off-by: Kyle Meyer <kyle@kyleam.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Author: kyleam

Documentation/config.txt

@@ -663,13 +663,13 @@ alternative to having an `init.templateDir` where you've changed
 default hooks.
 
 core.editor::
-	Commands such as `commit` and `tag` that lets you edit
-	messages by launching an editor uses the value of this
+	Commands such as `commit` and `tag` that let you edit
+	messages by launching an editor use the value of this
 	variable when it is set, and the environment variable
 	`GIT_EDITOR` is not set.  See linkgit:git-var[1].
 
 core.commentChar::
-	Commands such as `commit` and `tag` that lets you edit
+	Commands such as `commit` and `tag` that let you edit
 	messages consider a line that begins with this character
 	commented, and removes them after the editor returns
 	(default '#').