SF bug #1108303: fix .split() maxsplit doc

Docs incorrectly stated that maxsplit=0 would cause unlimited splitting.

Doc/lib/libstdtypes.tex

@@ -757,7 +757,7 @@ string this method is called on.
 Return a list of the words in the string, using \var{sep} as the
 delimiter string.  If \var{maxsplit} is given, at most \var{maxsplit}
 splits are done. (thus, the list will have at most \code{\var{maxsplit}+1}
-elements).  If \var{maxsplit} is not specified or is zero, then there
+elements).  If \var{maxsplit} is not specified, then there
 is no limit on the number of splits (all possible splits are made).
 Consecutive delimiters are not grouped together and are
 deemed to delimit empty strings (for example, \samp{'1,,2'.split(',')}