doc: removed LTS label from v4 in doc version picker

Fixes: #20903

PR-URL: #20904
Reviewed-By: Weijia Wang <[email protected]>
Reviewed-By: Rich Trott <[email protected]>
Reviewed-By: Trivikram Kamat <[email protected]>
Reviewed-By: Luigi Pinca <[email protected]>
Reviewed-By: Vse Mozhet Byt <[email protected]>
Reviewed-By: Colin Ihrig <[email protected]>
Reviewed-By: James M Snell <[email protected]>

tools/doc/html.js

@@ -345,7 +345,7 @@ function altDocs(filename, docCreated) {
     { num: '7.x' },
     { num: '6.x', lts: true },
     { num: '5.x' },
-    { num: '4.x', lts: true },
+    { num: '4.x' },
     { num: '0.12.x' },
     { num: '0.10.x' }
   ];