Added a note about coding standards and method arguments

Author: javiereguiluz

contributing/code/standards.rst

@@ -160,6 +160,9 @@ Structure
   ``tearDown`` methods of PHPUnit tests, which should always be the first methods
   to increase readability;
 
+* Declare all the arguments in the same line as the method/function name, no
+  matter how many arguments there are;
+
 * Use parentheses when instantiating classes regardless of the number of
   arguments the constructor has;