Docs: clarify that pointer events classes don't affect keyboard interaction (#31134)

* Docs: clarify that pointer events classes don't affect keyboard interaction

* Neutralise example links that are `pe-none`

site/content/docs/5.0/utilities/interactions.md

@@ -18,10 +18,14 @@ Change the way in which the content is selected when the user interacts with it.
 
 ## Pointer events
 
-Bootstrap provides `pe-none` and `pe-auto` classes to prevent or add element interactions.
+Bootstrap provides `.pe-none` and `.pe-auto` classes to prevent or add element interactions.
 
 {{< example >}}
-<p><a href="#" class="pe-none">This link</a> can not be clicked.</p>
+<p><a href="#" class="pe-none" tabindex="-1" aria-disabled="true">This link</a> can not be clicked.</p>
 <p><a href="#" class="pe-auto">This link</a> can be clicked (this is default behaviour).</p>
-<p class="pe-none"><a href="#">This link</a> can not be clicked because the <code>pointer-events</code> property is inherited from its parent. However, <a href="#" class="pe-auto">this link</a> has a <code>pe-auto</code> class and can be clicked.</p>
+<p class="pe-none"><a href="#" tabindex="-1" aria-disabled="true">This link</a> can not be clicked because the <code>pointer-events</code> property is inherited from its parent. However, <a href="#" class="pe-auto">this link</a> has a <code>pe-auto</code> class and can be clicked.</p>
 {{< /example >}}
+
+{{< callout warning >}}
+The `.pe-none` class (and the `pointer-events` CSS property it sets) only prevents interactions with a pointer (mouse, stylus, touch). Links and controls with `.pe-none` are, by default, still focusable and actionable for keyboard users. To ensure that they are completely neutralized even for keyboard users, you may need to add further attributes such as `tabindex="-1"` (to prevent them from receiving keyboard focus) and `aria-disabled="true"` (to convey the fact they are effectively disabled to assistive technologies), and possibly use JavaScript to completely prevent them from being actionable. For form controls, consider using the `disabled` HTML attribute instead.
+{{< /callout >}}
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