Documentation/CodingStyle: Add an example for braces

Add another example of required braces when using a compound statement in
a loop.
Signed-off-by: NGary R Hook <gary.hook@amd.com>
Signed-off-by: NJonathan Corbet <corbet@lwn.net>

Documentation/process/coding-style.rst

@@ -200,6 +200,15 @@ statement; in the latter case use braces in both branches:
 		otherwise();
 	}
 
+Also, use braces when a loop contains more than a single simple statement:
+
+.. code-block:: c
+
+	while (condition) {
+		if (test)
+			do_something();
+	}
+
 3.1) Spaces
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