coding-style: fix verb typo

In the Identation section there is a list of instructions in
second-person. The offending line uses third-person singular.

Signed-off-by: Gabriele Ricciardi <[e-mail]>
Acked-by: Randy Dunlap <[e-mail]>
Signed-off-by: Jonathan Corbet <[e-mail]>
Message-ID: <[e-mail]>

Documentation/process/coding-style.rst

···
 	if (condition)
 		do_this(), do_that();
 
-Always uses braces for multiple statements:
+Always use braces for multiple statements:
 
 .. code-block:: c