Removed "This will be discussed later." where it's not. Reported by

Clay Spence <cspence@sarnoff.com>; see entry in ../TODO.

Doc/ext/ext.tex

@@ -143,10 +143,10 @@ passed to the C function.  The C function always has two arguments,
 conventionally named \var{self} and \var{args}.
 
 The \var{self} argument is only used when the C function implements a
-built-in method.  This will be discussed later. In the example,
-\var{self} will always be a \NULL{} pointer, since we are defining
-a function, not a method.  (This is done so that the interpreter
-doesn't have to understand two different types of C functions.)
+built-in method, not a function. In the example, \var{self} will
+always be a \NULL{} pointer, since we are defining a function, not a
+method.  (This is done so that the interpreter doesn't have to
+understand two different types of C functions.)
 
 The \var{args} argument will be a pointer to a Python tuple object
 containing the arguments.  Each item of the tuple corresponds to an