Change comment style in version selector (#11283) (#11304)

(cherry picked from commit 246b5ff)

Signed-off-by: Fanit Kolchina <[email protected]>
Signed-off-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>
Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

Author: opensearch-trigger-bot[bot]

assets/js/_version-selector.js

@@ -86,7 +86,7 @@ const tpl = `
         background: #fff;
         z-index: 1;
 
-        // for scroll
+        /* for scroll */
         max-height: 60vh;
         overflow-y: auto;
         overflow-x: hidden;
@@ -112,7 +112,7 @@ const tpl = `
         background: rgba(0, 0, 0, 0.5);
     }
 
-    // for Firefox
+    /* for Firefox */
     #dropdown {
         scrollbar-width: thin;
         scrollbar-color: #c1c1c1 #f1f1f1;