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/libgdbm.tex b/Doc/libgdbm.tex
index 73fc9ab..08d447f 100644
--- a/Doc/libgdbm.tex
+++ b/Doc/libgdbm.tex
@@ -35,7 +35,7 @@
 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 \code{gdbm} database and return a \code{gdbm} object.  The
 \var{filename} argument is the name of the database file.