[Docs] Remove redundant visually hidden "(current)" from pagination controls

[patrickhlauke]

https://getbootstrap.com/docs/4.5/components/pagination/
https://v5.getbootstrap.com/docs/5.0/components/pagination/

Remove the <span class="visually-hidden">(current)</span> where the controls already have aria-current

xref #30079 (comment)