When forming the <A> tag for a \seepep or \seerfc, make sure we strip

HTML markup from the string used as the title in the TITLE attribute.

This fixes formatting in the "What's New in Python 2.1" document.

Doc/perl/python.perl

@@ -1497,6 +1497,14 @@ sub do_cmd_seemodule{
       . $_;
 }
 
+sub strip_html_markup($){
+    my $str = @_[0];
+    my $s = "$str";
+    $s =~ s/<[a-zA-Z0-9]+(\s+[a-zA-Z0-9]+(\s*=\s*(\'[^\']*\'|\"[^\"]*\"|[a-zA-Z0-9]+))?)*\s*>//g;
+    $s =~ s/<\/[a-zA-Z0-9]+>//g;
+    return $s;
+}
+
 sub handle_rfclike_reference{
     local($_, $what, $format) = @_;
     my $rfcnum = next_argument();
@@ -1504,9 +1512,10 @@ sub handle_rfclike_reference{
     my $text = next_argument();
     my $url = get_rfc_url($rfcnum, $format);
     my $icon = get_link_icon($url);
+    my $attrtitle = strip_html_markup($title);
     return '<dl compact class="seerfc">'
       . "\n    <dt><a href=\"$url\""
-      . "\n        title=\"$title\""
+      . "\n        title=\"$attrtitle\""
       . "\n        >$what $rfcnum, <em>$title</em>$icon</a>"
       . "\n    <dd>$text\n  </dl>"
       . $_;