MenuToggle - add aria attributes to documentation

Describe the problem
This is an issue with

• Patternfly 5
• Patternfly 6
• other

Based on an accessibility review by @adamjohnson and myself, we are concerned that menu toggle does not give sufficient examples or advice on how to implement it with the element it toggles in an accessible way. Specifically, that it requires the following:

• An aria-controls property that includes the IDREF of the element it expanded
• An aria-haspopup property that indicates the type of popup
• That the aria-expanded property changes when the toggled element is visible.

How do you reproduce the problem?

1. Go to menu toggle docs.
2. Note that there are no examples of how a menu-toggle interacts with the object it toggles.

Expected behavior
See the WAI ARIA Authoring Practice Guide's navigation menu button example for correct usage so that users are less likely to make accessibility errors.
Is this issue blocking you?
No

Any other information?

Without documenting how to use this button correctly the docs themselves fail to meet ATAG Principle B2, so the docs in their current state are an accessibility issue.

cc/ @markcaron

Open the linked menu toggle documentation and compare its guidance with the WAI-ARIA menu button example. Add examples and advice covering aria-controls, aria-haspopup, and aria-expanded for the toggled element. Done means users can follow the page to implement the interaction accessibly.