Adds reference to PEP 318 standard in the compound_statements.rst after Function definitions section.

Author: Rasputin2

Doc/reference/compound_stmts.rst

@@ -1368,6 +1368,8 @@ access the local variables of the function containing the def.  See section
       Support for forward references within annotations by preserving
       annotations in a string form at runtime instead of eager evaluation.
 
+   :pep:`318` - Decorators for Functions and Methods
+      Function and method decorators were introduced.
 
 .. _class: