Fix markup.

Will backport to release25-maint.

Doc/lib/libctypes.tex

@@ -2299,12 +2299,10 @@ Windows only: Represents a \class{HRESULT} value, which contains success
 or error information for a function or method call.
 \end{classdesc*}
 
-\code{py{\_}object} : classdesc*
-\begin{quote}
-
+\begin{classdesc*}{py_object}
 Represents the C \code{PyObject *} datatype.  Calling this with an
 without an argument creates a \code{NULL} \code{PyObject *} pointer.
-\end{quote}
+\end{classdesc*}
 
 The \code{ctypes.wintypes} module provides quite some other Windows
 specific data types, for example \code{HWND}, \code{WPARAM}, or \code{DWORD}.