Fixes spelling and formatting errors

Author: bryanagee

contributing/code/standards.rst

@@ -94,10 +94,10 @@ Structure
 
 * Add a single space after each comma delimiter;
 
-* Add a single space around operators (``==``, ``&&``, ...), with the excption
-  of the not (!) operator;
+* Add a single space around operators (``==``, ``&&``, ...), with the 
+  exception  of the not (``!``) operator;
 
-* Place the not operator adjacent to the variable that it affects
+* 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;