Signature for dir() omitted the optional argument.

Doc/lib/libfuncs.tex

@@ -125,7 +125,7 @@ class instances are callable if they have a \method{__call__()} method.
   \code{del \var{x}.\var{foobar}}.
 \end{funcdesc}
 
-\begin{funcdesc}{dir}{}
+\begin{funcdesc}{dir}{\optional{object}}
   Without arguments, return the list of names in the current local
   symbol table.  With an argument, attempts to return a list of valid
   attribute for that object.  This information is gleaned from the

Doc/libfuncs.tex

@@ -125,7 +125,7 @@ class instances are callable if they have a \method{__call__()} method.
   \code{del \var{x}.\var{foobar}}.
 \end{funcdesc}
 
-\begin{funcdesc}{dir}{}
+\begin{funcdesc}{dir}{\optional{object}}
   Without arguments, return the list of names in the current local
   symbol table.  With an argument, attempts to return a list of valid
   attribute for that object.  This information is gleaned from the