Revise the markup related to the grammar productions to increase the
level of predictability.  This is not really "good" markup, but is arguably
better than we had before.
This closes SF bug #523117.
diff --git a/Doc/perl/python.perl b/Doc/perl/python.perl
index 332f518..92cf655 100644
--- a/Doc/perl/python.perl
+++ b/Doc/perl/python.perl
@@ -807,6 +807,18 @@
             . $_);
 }
 
+sub do_cmd_productioncont{
+    local($_) = @_;
+    my $defn = next_argument();
+    return ("<tr valign=\"baseline\">\n"
+            . "    <td>&nbsp;</td>\n"
+            . "    <td>&nbsp;</td>\n"
+            . "    <td><code>"
+            . translate_commands($defn)
+            . "</code></td></tr>"
+            . $_);
+}
+
 sub process_grammar_files{
     my $lang;
     my $filename;
@@ -847,6 +859,7 @@
 
 sub strip_grammar_markup{
     local($_) = @_;
+    s/\\productioncont/              /g;
     s/\\production(<<\d+>>)(.+)\1/\n\2 ::= /g;
     s/\\token(<<\d+>>)(.+)\1/\2/g;
     s/\\e([^a-zA-Z])/\\\1/g;