Remove ctypedef of size_t

docs/external_C_code.rst

@@ -119,15 +119,15 @@ match the C ones, and in some cases they shouldn't or can't. In particular:
        
 
 
-4. If the header file uses ``typedef`` names such as :ctype:`size_t` to refer
+4. If the header file uses ``typedef`` names such as :ctype:`word` to refer
    to platform-dependent flavours of numeric types, you will need a
    corresponding :keyword:`ctypedef` statement, but you don't need to match
    the type exactly, just use something of the right general kind (int, float,
    etc). For example,::
 
-       ctypedef int size_t
+       ctypedef int word
 
-   will work okay whatever the actual size of a :ctype:`size_t` is (provided the header
+   will work okay whatever the actual size of a :ctype:`word ` is (provided the header
    file defines it correctly). Conversion to and from Python types, if any, will also 
    be used for this new type.