docs(template-no-empty-headings): correct WAI-ARIA section reference

The rule and test comments cited "WAI-ARIA 1.2 §6.6 aria-hidden value
table". §6.6 is "Taxonomy of WAI-ARIA States and Properties" and only
categorizes attributes; the aria-hidden value table lives in §6.7
"Definitions of States and Properties". Use the bare #aria-hidden
anchor, which is unambiguous.

Author: johanrd

lib/rules/template-no-empty-headings.js

@@ -2,8 +2,9 @@ const { getStaticAttrValue } = require('../utils/static-attr-value');
 
 const HEADINGS = new Set(['h1', 'h2', 'h3', 'h4', 'h5', 'h6']);
 
-// Aligned with WAI-ARIA 1.2 §6.6 aria-hidden value table: only an explicit
-// "true" (ASCII case-insensitive, whitespace-trimmed) hides the element.
+// Aligned with the WAI-ARIA 1.2 [`aria-hidden`](https://www.w3.org/TR/wai-aria-1.2/#aria-hidden)
+// value table (`true | false | undefined (default)`): treat only an explicit
+// "true" (ASCII case-insensitive, whitespace-trimmed) as hiding the element.
 // Valueless `<h1 aria-hidden>`, empty-string `aria-hidden=""`, and
 // `aria-hidden="false"` all resolve to the default `undefined` / explicit
 // false — so the empty-content check still applies. All shape-unwrapping

tests/lib/rules/template-no-empty-headings.js

@@ -168,7 +168,8 @@ ruleTester.run('template-no-empty-headings', rule, {
       output: null,
       errors: [{ messageId: 'emptyHeading' }],
     },
-    // Per WAI-ARIA 1.2 §6.6 aria-hidden value table: valueless /
+    // Per the WAI-ARIA 1.2 `aria-hidden` value table
+    // (https://www.w3.org/TR/wai-aria-1.2/#aria-hidden): valueless /
     // empty-string `aria-hidden` resolves to the default `undefined`,
     // not `true`. Empty headings with these forms still flag.
     {