gitweb: make search help link less ugly

The search help link was a superscript question mark right next to
a drop-down menu, which looks misaligned and is a cramped and
awkward click target. Remove the superscript tags and add some
spacing to fix these nits. Add a title attribute to provide an
explanatory mouseover.

Signed-off-by: Tony Finch <dot@dotat.at>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

gitweb/gitweb.perl

@@ -4030,8 +4030,8 @@ sub print_search_form {
 	      $cgi->input({-name=>"h", -value=>$search_hash, -type=>"hidden"}) . "\n" .
 	      $cgi->popup_menu(-name => 'st', -default => 'commit',
 	                       -values => ['commit', 'grep', 'author', 'committer', 'pickaxe']) .
-	      $cgi->sup($cgi->a({-href => href(action=>"search_help")}, "?")) .
-	      " search:\n",
+	      " " . $cgi->a({-href => href(action=>"search_help"),
+			     -title => "search help" }, "?") . " search:\n",
 	      $cgi->textfield(-name => "s", -value => $searchtext, -override => 1) . "\n" .
 	      "<span title=\"Extended regular expression\">" .
 	      $cgi->checkbox(-name => 'sr', -value => 1, -label => 're',