fixed two typos in pprint reference page
diff --git a/Doc/lib/libpprint.tex b/Doc/lib/libpprint.tex
index cd5c184..698b2f8 100644
--- a/Doc/lib/libpprint.tex
+++ b/Doc/lib/libpprint.tex
@@ -197,10 +197,10 @@
presented which is already represented in \var{context}, the third
return value should be true. Recursive calls to the \method{format()}
method should add additional entries for containers to this
-dictionary. The fourth argument, \var{maxlevels}, gives the requested
+dictionary. The third argument, \var{maxlevels}, gives the requested
limit to recursion; this will be \code{0} if there is no requested
limit. This argument should be passed unmodified to recursive calls.
-The fourth argument, \var{level} gives the current level; recursive
+The fourth argument, \var{level}, gives the current level; recursive
calls should be passed a value less than that of the current call.
\versionadded{2.3}
\end{methoddesc}