Docs: add missing aria-label to SVG with tooltip (#40808)

Co-authored-by: Julien Déramond <juderamond@gmail.com>

site/content/docs/5.3/components/tooltips.md

@@ -111,7 +111,7 @@ And with custom HTML added:
 With an SVG:
 
 <div class="bd-example tooltip-demo">
-  <a href="#" class="d-inline-block" data-bs-toggle="tooltip" data-bs-title="Default tooltip">
+  <a href="#" class="d-inline-block" data-bs-toggle="tooltip" data-bs-title="Default tooltip" aria-label="Hover or focus to see default tooltip">
     <svg xmlns="http://www.w3.org/2000/svg" width="50" height="50" viewBox="0 0 100 100">
       <rect width="100%" height="100%" fill="#563d7c"/>
       <circle cx="50" cy="50" r="30" fill="#007bff"/>