Small markup adjustments for consistency.
diff --git a/Doc/api/concrete.tex b/Doc/api/concrete.tex
index 26a82d3..dae853a 100644
--- a/Doc/api/concrete.tex
+++ b/Doc/api/concrete.tex
@@ -591,11 +591,11 @@
object is not one.
Pass the address of an existing string object as an lvalue (it may
be written into), and the new size desired. On success, \var{*string}
- holds the resized string object and 0 is returned; the address in
+ holds the resized string object and \code{0} is returned; the address in
\var{*string} may differ from its input value. If the
reallocation fails, the original string object at \var{*string} is
deallocated, \var{*string} is set to \NULL{}, a memory exception is set,
- and -1 is returned.
+ and \code{-1} is returned.
\end{cfuncdesc}
\begin{cfuncdesc}{PyObject*}{PyString_Format}{PyObject *format,