Updated the tags

Author: mattscepter

lib/rules/heading-order.json

@@ -4,7 +4,7 @@
   "selector": "h1, h2, h3, h4, h5, h6, [role=heading]",
   "matches": "heading-matches",
   "tags": [
-    "cat.semantics",
+    "cat.structure",
     "wcag2aaa",
     "wcag2410",
     "a11y-engine",