fix: tagname-specialchars description (#714)

Author: coliff

src/core/rules/tagname-specialchars.ts

@@ -2,7 +2,7 @@ import { Rule } from '../types'
 
 export default {
   id: 'tagname-specialchars',
-  description: 'All html element names must be in lowercase.',
+  description: 'All special characters must be escaped.',
   init(parser, reporter) {
     const specialchars = /[^a-zA-Z0-9\-:_]/