Fix a few typos

Author: NickVolynkin

doc/contributing/contributing.rst

@@ -116,10 +116,10 @@ There are several ways to improve the documentation:
 * **The easiest one** is to leave your comment on the web documentation page.
   To use the built-in feedback form, select the text that you want to comment on,
   press :kbd:`Ctrl+Enter`, type your comment in the pop-up window,
-  and click :guilable:`Submit`.
+  and click :guilabel:`Submit`.
   On mobile screens, an :guilabel:`Error?` button appears at the bottom of the screen,
   which opens the same pop-up window.
-  `You can point out an error,
+  You can point out an error,
   provide feedback on the current article, or suggest changes.
   We review each comment and work with it.
 * **Advanced**: All Tarantool documentation tasks can be found in the