Typo fix.

Doc/ext/newtypes.tex

@@ -43,7 +43,7 @@ static PyTypeObject noddy_NoddyType;
 
 This names the type object that will be defining further down in the
 file.  It can't be defined here because its definition has to refer to
-functions that have no yet been defined, but we need to be able to
+functions that have not yet been defined, but we need to be able to
 refer to it, hence the declaration.
 
 \begin{verbatim}