Change "\," to just "," in function signatures.  This is easier to maintain,
works better with LaTeX2HTML, and allows some simplification of the python.sty
macros.
diff --git a/Doc/lib/libdbm.tex b/Doc/lib/libdbm.tex
index 416a6b0..35e0b4c 100644
--- a/Doc/lib/libdbm.tex
+++ b/Doc/lib/libdbm.tex
@@ -20,7 +20,7 @@
 raised for general mapping errors like specifying an incorrect key.
 \end{excdesc}
 
-\begin{funcdesc}{open}{filename\, \optional{flag\, \optional{mode}}}
+\begin{funcdesc}{open}{filename, \optional{flag, \optional{mode}}}
 Open a dbm database and return a dbm object.  The \var{filename}
 argument is the name of the database file (without the \file{.dir} or
 \file{.pag} extensions).