doc: remove space above version picker

PR-URL: #34768
Fixes: #34767
Fixes: #34447
Reviewed-By: Derek Lewis <DerekNonGeneric@inf.is>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Harshitha K P <harshitha014@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

doc/api_assets/style.css

@@ -145,7 +145,7 @@ ol.version-picker {
   list-style: none;
   position: absolute;
   right: 0;
-  top: 1.25rem;
+  top: 100%;
   width: 100%;
 }