fix(html): HTML should not be highlighted as XML

Author: davidhcefx

xml.nanorc

@@ -1,7 +1,7 @@
 ## Here is an example for xml files.
 ##
 
-syntax "XML" ".*\.([jrs]?html?|xml|sgml?|rng|vue|mei|musicxml)$"
+syntax "XML" "\.([jrsx]html?|xml|sgml?|rng|vue|mei|musicxml)$"
 header "<\?xml.*version=.*\?>"
 magic "(XML|SGML) (sub)?document"
 comment "<!--|-->"