don't set focus styles on the anchor, just set hover styles

Fixed minor typo

[Docs] Add missing :focus styles

Double up :hover styles to also apply on :focus (particularly the
masthead button needs this, as otherwise it gives no visible indication
of being focused)

Fix modal id in doc example (Fix #21665)

Remove incorrect aria-multiselectable

Closes https://github.com/twbs/bootstrap/issues/21635

* Change it's to its.

* Fix links

* Fix typos

Close #21090 - Fix aria-pressed attribute for buttons in container with data-attribute="buttons"

Custom Forms: Allow Chrome/Firefox feature that lets the user drag and drop into file inputs (#20033)

* Restored functionality of dragging files into .custom-file inputs.

* Replaced padding with height on .custom-file-input