In description of \D, revise markup so that the caret shows up in the HTML

version as well as the dvi form.  Without the fix, it showed up as an extra
zero character.

Bug reported by Hugh Sasse <hgs@dmu.ac.uk>.

Doc/lib/libre.tex

@@ -219,7 +219,7 @@ Python's string literals.
 equivalent to the set \code{[0-9]}.
 %
 \item[\code{\e D}]Matches any non-digit character; this is
-equivalent to the set \code{[\^0-9]}.
+equivalent to the set \code{[{\^}0-9]}.
 %
 \item[\code{\e s}]Matches any whitespace character; this is
 equivalent to the set \code{[ \e t\e n\e r\e f\e v]}.

Doc/libre.tex

@@ -219,7 +219,7 @@ Python's string literals.
 equivalent to the set \code{[0-9]}.
 %
 \item[\code{\e D}]Matches any non-digit character; this is
-equivalent to the set \code{[\^0-9]}.
+equivalent to the set \code{[{\^}0-9]}.
 %
 \item[\code{\e s}]Matches any whitespace character; this is
 equivalent to the set \code{[ \e t\e n\e r\e f\e v]}.