feat: update description

Author: VVVi

docs.html

@@ -227,9 +227,10 @@ <h2 id="browse">Browse, filter and preview</h2>
               Content-Type, Cache-Control, custom user metadata and more.
             </li>
             <li>
-              Folder rows also offer <strong>Calculate Folder Size</strong> in
-              the context menu. BucketDock walks all nested subfolders and shows
-              the total size of every object under that prefix.
+              Folder rows also offer <strong>Folder Size</strong> in the context
+              menu — or just click the <code>—</code> in the Size column.
+              BucketDock walks all nested subfolders and shows the total size of
+              every object under that prefix.
             </li>
             <li>
               Renaming a folder or copying a folder between buckets is