Links naming api with coding guidelines.

doc/apis.txt

@@ -79,3 +79,10 @@ string                  str
 identifier              ident
 indentation             indent
 -------------------     ------------   --------------------------------------
+
+
+Coding Guidelines
+=================
+
+For coding guidelines see the `Internals of the Nimrod Compiler
+<intern.html#coding-guidelines>`_ documentation.

doc/intern.txt

@@ -69,8 +69,10 @@ Coding Guidelines
 * Max line length is 80 characters.
 * Provide spaces around binary operators if that enhances readability.
 * Use a space after a colon, but not before it.
-* Start types with a capital ``T``, unless they are pointers/references which start
-  with ``P``. 
+* Start types with a capital ``T``, unless they are pointers/references which
+  start with ``P``.
+
+See also the `API naming design <apis.html>`_ document.
 
 
 Porting to new platforms