Mark a couple of types that had not been marked.

Doc/ext/extending.tex

@@ -663,16 +663,16 @@ This is to \samp{s\#} as \samp{z} is to \samp{s}.
 
 \item[\samp{u} (Unicode object) {[Py_UNICODE *]}]
 Convert a Python Unicode object to a C pointer to a null-terminated
-buffer of 16-bit Unicode (UTF-16) data.  As with \samp{s}, there is no need
-to provide storage for the Unicode data buffer; a pointer to the
-existing Unicode data is stored into the Py_UNICODE pointer variable whose
-address you pass.  
+buffer of 16-bit Unicode (UTF-16) data.  As with \samp{s}, there is no
+need to provide storage for the Unicode data buffer; a pointer to the
+existing Unicode data is stored into the \ctype{Py_UNICODE} pointer
+variable whose address you pass.  
 
 \item[\samp{u\#} (Unicode object) {[Py_UNICODE *, int]}]
 This variant on \samp{u} stores into two C variables, the first one
 a pointer to a Unicode data buffer, the second one its length.
 Non-Unicode objects are handled by interpreting their read buffer
-pointer as pointer to a Py_UNICODE array.
+pointer as pointer to a \ctype{Py_UNICODE} array.
 
 \item[\samp{es} (string, Unicode object or character buffer compatible
 object) {[const char *encoding, char **buffer]}]