CLDR-18861 Migrate Adding/Fixing Plural and Ordinals page

[AEApple]

CLDR-18861

• This PR completes the ticket.

ALLOW_MANY_COMMITS=true

[github-actions]

✨ This commit deployed to https://4c4bb1e1.cldr.pages.dev
✨ This PR deployed to https://pr4900.cldr.pages.dev

Changed Pages in the last commit:

• development/updating-codes/update-plurals.md

[DavidLRowe]

I'm not familiar enough with the tooling to comment on that section.

In line 27:

 - Diff the plurals chart against the old one: eg v.s. https://unicode-org.github.io/cldr-staging/charts/38/supplemental/language_plural_rules.html

Is "v.s." necessary?
Is "/38/" the number of the previous version? Is it worth adding "(where "38" is the version number of the old chart)"

[AEApple]

This was just to migrate the page. Someone should clean it up in a different PR. Can someone please approve so that I can merge this PR?

[DavidLRowe]

RSLGTM