[508] Add page info to Pagination documentation

[Mottie]

Description

To provide optimal screenreader usability, the pagination documentation needs to include a section on adding a page info block above the content. When the page is changed, focus should be moved to this paragraph. Example:

Showing 21 through 30 of 50 items, Page 3 of 5

------
card 21
------
card 22
------
...
------
card 30
------

< Prev 1 [2] 3 4 5 Next >

Example from Facilities locator

VA.gov search example

cc: @joshkimux

Tasks

• [ ] Add documentation on adding a pager information block that receives focus after changing pages
• [ ] Provide examples
• [ ] Accessibility review of content
• [ ] Use recommended wording from https://github.com/department-of-veterans-affairs/va.gov-team/issues/41835

Definition of done

• [ ] All tasks complete

[caw310]

Notes from DSC meeting when this was discussed: https://docs.google.com/document/d/1ZGwxDt3EQhIzHhEowdhhmbbRRB7a-xtHMr85QrK5E-s/edit?usp=sharing

• Robin to fix bub
• Natalie to sync with Megan.
• Make a component is better choice.
• Will add it to the queue.