docs(progress bar): updated usage, usability and accessibility

Author: petrinetang

portal/collections/_components/progress-bar.html

@@ -182,10 +182,12 @@ <h2 class="title fw-bold" id="usage-guidelines">Usage guidelines</h2>
         <!-- Usability guidelines Section -->
         <section name="section-usability-guidelines">
             <h2 class="title fw-bold" id="usability-guidelines">Usability guidelines</h2>
-                <p class="fw-bold mb-0">Use consistent progress bars</p>
+            <p><b>Use consistent progress bars</b><br>
                 Do use one type of indicator bar style and not switch between as this may cause confusion to the user.
-                <p class="fw-bold mb-0">Behaviour</p>
+                </p>
+                <p><b>Behaviour</b><br>
                 Keep progress bar moving to allow users to know their task is progressing. Users may associate a stationary indicator as a stalled process.
+                </p>
         </section>
 
         <!-- Accessibility guidelines Section -->