Fix typos

lisp/org-agenda.el

@@ -406,7 +406,7 @@ where
 
 desc   A description string to be displayed in the dispatcher menu.
 cmd    An agenda command, similar to the above.  However, tree commands
-       are no allowed, but instead you can get agenda and global todo list.
+       are not allowed, but instead you can get agenda and global todo list.
        So valid commands for a set are:
        (agenda \"\" settings)
        (alltodo \"\" settings)

lisp/org-list.el

@@ -207,7 +207,7 @@ Valid values are ?. and ?\).  To get both terminators, use t."
   :group 'org-plain-lists
   :type '(choice (const :tag "dot like in \"2.\"" ?.)
 		 (const :tag "paren like in \"2)\"" ?\))
-		 (const :tab "both" t)))
+		 (const :tag "both" t)))
 
 (defcustom org-alphabetical-lists nil
   "Non-nil means single character alphabetical bullets are allowed.

lisp/org.el

@@ -6805,7 +6805,7 @@ This command works around this by showing a copy of the current buffer
 in an indirect buffer, in overview mode.  You can dive into the tree in
 that copy, use org-occur and incremental search to find a location.
 When pressing RET or `Q', the command returns to the original buffer in
-which the visibility is still unchanged.  After RET is will also jump to
+which the visibility is still unchanged.  After RET it will also jump to
 the location selected in the indirect buffer and expose the headline
 hierarchy above."
   (interactive "P")