docs(toggle-group): Adds example documentation.

[edonehoo]

Closes #10295

[patternfly-build]

Preview: https://patternfly-react-pr-10309.surge.sh

A11y report: https://patternfly-react-pr-10309-a11y.surge.sh

[edonehoo]

@thatblindgeye @tlabaj have some toggle group docs for your review! Couple things:

• Not sure if the isSelected guidance is correct or detailed enough, so please lmk how that can be improved!

• Regarding the iconPosition prop mention that I added to the "with text and icons" example -- I don't see that used in the example or listed in the props table? Maybe that'll pop up as a result of feat(Toggle group): Add support for icon position #10291 (review), but wanted to mention just in case something needs to be added

[thatblindgeye]

Thanks for adding this content! I (hopefully) answered your questions/comments from above with my below comments 😆

[thatblindgeye]

Since the update that added this prop was in the v6 branch, this line should be removed for this PR, but we would want to add it to the v6 branch whenever this update gets pulled into v6 (or we could open a separate PR that adds this content to v6).

[edonehoo]

Ah, that makes sense. Do you think I can just link that additional PR to the same issue, or is a new issue needed?

[thatblindgeye]

I think we've done either way, but a new issue wouldn't hurt. For what it's worth Michael had split out an issue assigned to me in Core into 2 separate issues, one for V5 and one for V6.

[tlabaj]

LGTM