docs(CModal): update content

Author: mrholek

packages/docs/content/components/modal.mdx

@@ -38,12 +38,8 @@ Below is a static react modal component example (meaning its `position` and `dis
           <p>React Modal body text goes here.</p>
         </div>
         <div className="modal-footer">
-          <button type="button" className="btn btn-secondary">
-            Close
-          </button>
-          <button type="button" className="btn btn-primary">
-            Save changes
-          </button>
+          <button type="button" className="btn btn-secondary">Close</button>
+          <button type="button" className="btn btn-primary">Save changes</button>
         </div>
       </div>
     </div>
@@ -1030,7 +1026,7 @@ For modals that simply appear rather than fade into view, set `transition` to `f
 
 ### Accessibility
 
-Be sure to add `aria-labelledby="..."`, referencing the modal title, to `<CModal />` Additionally, you may give a description of your modal dialog with `aria-describedby` on `<CModal>`. Note that you don’t need to add `role="dialog` since we already add it.
+Be sure to add `aria-labelledby="..."`, referencing the modal title, to `<CModal />` Additionally, you may give a description of your modal dialog with `aria-describedby` on `<CModal>`. Note that you don’t need to add `role="dialog`, `aria-hidden="true"`, and `aria-modal="true"` since we already add it.
 
 ## Optional sizes