Make code section XHTML compatible

Corrected typo (superfluous 'a')

Author: albert-github

lib/Doxygen/Filter/Perl.pm

@@ -627,7 +627,7 @@ sub _PrintMethodBlock
     # Print collapsible source code block   
     print "\@htmlonly[block]\n";
     print "<div id='codesection-$method' class='dynheader closed' style='cursor:pointer;' onclick='return toggleVisibility(this)'>\n";
-    print "\t<img id='codesection-$method-trigger' src='closed.png' alt='open/close icon' style='display:inline'/a> <b>Code:</b>\n";
+    print "\t<img id='codesection-$method-trigger' src='closed.png' alt='open/close icon' style='display:inline'/> <b>Code:</b>\n";
     print "</div>\n";
     print "<div id='codesection-$method-summary' class='dyncontent' style='display:block;font-size:small;'>click to view</div>\n";
     print "<div id='codesection-$method-content' class='dyncontent' style='display: none;'>\n";