tools: do not autolink section to itself

Fix a regression in the new doc generation toolchain.
PR-URL: #22138
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Sam Ruby <rubys@intertwingly.net>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>

Author: vsemozhetbyt

tools/doc/html.js

@@ -226,8 +226,8 @@ function preprocessElements({ filename }) {
 }
 
 // Do not link to the section we are already in.
-constnoLinking=filename==='documentation'&&
-heading!==null&&heading.value==='Stability Index';
+constnoLinking=filename.includes('documentation')&&
+heading!==null&&heading.children[0].value==='Stability Index';
 
 // collapse blockquote and paragraph into a single node
 node.type='paragraph';