Minor markup nits around use of \optional.
diff --git a/Doc/lib/libre.tex b/Doc/lib/libre.tex
index b7c88e3..db11703 100644
--- a/Doc/lib/libre.tex
+++ b/Doc/lib/libre.tex
@@ -409,7 +409,7 @@
\var{string}, use \method{search()} instead.
\end{funcdesc}
-\begin{funcdesc}{split}{pattern, string, \optional{, maxsplit\code{ = 0}}}
+\begin{funcdesc}{split}{pattern, string\optional{, maxsplit\code{ = 0}}}
Split \var{string} by the occurrences of \var{pattern}. If
capturing parentheses are used in \var{pattern}, then the text of all
groups in the pattern are also returned as part of the resulting list.
@@ -510,8 +510,8 @@
Compiled regular expression objects support the following methods and
attributes:
-\begin{methoddesc}[RegexObject]{search}{string\optional{, pos}\optional{,
- endpos}}
+\begin{methoddesc}[RegexObject]{search}{string\optional{, pos\optional{,
+ endpos}}}
Scan through \var{string} looking for a location where this regular
expression produces a match, and return a
corresponding \class{MatchObject} instance. Return \code{None} if no
@@ -522,8 +522,8 @@
meaning as for the \method{match()} method.
\end{methoddesc}
-\begin{methoddesc}[RegexObject]{match}{string\optional{, pos}\optional{,
- endpos}}
+\begin{methoddesc}[RegexObject]{match}{string\optional{, pos\optional{,
+ endpos}}}
If zero or more characters at the beginning of \var{string} match
this regular expression, return a corresponding
\class{MatchObject} instance. Return \code{None} if the string does not
@@ -546,7 +546,7 @@
searched for a match.
\end{methoddesc}
-\begin{methoddesc}[RegexObject]{split}{string, \optional{,
+\begin{methoddesc}[RegexObject]{split}{string\optional{,
maxsplit\code{ = 0}}}
Identical to the \function{split()} function, using the compiled pattern.
\end{methoddesc}
@@ -585,7 +585,7 @@
\class{MatchObject} instances support the following methods and attributes:
-\begin{methoddesc}[MatchObject]{group}{\optional{group1, group2, ...}}
+\begin{methoddesc}[MatchObject]{group}{\optional{group1, \moreargs}}
Returns one or more subgroups of the match. If there is a single
argument, the result is a single string; if there are
multiple arguments, the result is a tuple with one item per argument.
@@ -597,7 +597,7 @@
group number is negative or larger than the number of groups defined
in the pattern, an \exception{IndexError} exception is raised.
If a group is contained in a part of the pattern that did not match,
-the corresponding result is \code{None}. If a group is contained in a
+the corresponding result is \code{-1}. If a group is contained in a
part of the pattern that matched multiple times, the last match is
returned.
@@ -638,7 +638,7 @@
Return the indices of the start and end of the substring
matched by \var{group}; \var{group} defaults to zero (meaning the whole
matched substring).
-Return \code{None} if \var{group} exists but
+Return \code{-1} if \var{group} exists but
did not contribute to the match. For a match object
\var{m}, and a group \var{g} that did contribute to the match, the
substring matched by group \var{g} (equivalent to
@@ -661,7 +661,7 @@
For \class{MatchObject} \var{m}, return the 2-tuple
\code{(\var{m}.start(\var{group}), \var{m}.end(\var{group}))}.
Note that if \var{group} did not contribute to the match, this is
-\code{(None, None)}. Again, \var{group} defaults to zero.
+\code{(-1, -1)}. Again, \var{group} defaults to zero.
\end{methoddesc}
\begin{memberdesc}[MatchObject]{pos}