Adds bullet addressing bang placement

Author: bryanagee

contributing/code/standards.rst

@@ -97,6 +97,8 @@ Structure
 * Add a single space around operators (``==``, ``&&``, ...), with the excption
   of the not (!) operator;
 
++ Place the not operator adjacent to the variable that it affects
+
 * Add a comma after each array item in a multi-line array, even after the
   last one;