Fixed #35306 -- Improved documentation for the various date format settings

[lufafajoshua]

Trac ticket number

ticket-35306

Branch description

Updated documentation on localization formats usage and precedence.

Checklist

• This PR targets the main branch.
• The commit message is written in past tense, mentions the ticket number, and ends with a period.
• I have checked the "Has patch" ticket flag in the Trac system.
• I have added or updated relevant tests.
• I have added or updated relevant docs, including release notes if applicable.
• For UI changes, I have attached screenshots in both light and dark modes.

[nessita]

@lufafajoshua thank you for your work.

When this PR is ready for review, please update the checklist from the PR description, and don't forget to set the proper ticket flags for this to be listed in the branches needing review.

[sarahboyce]

Thank you for this @lufafajoshua ⭐ I have a few comments
Can you also update the PR title to better represent what this PR is trying to acheive?

[sarahboyce]

Thank you @lufafajoshua 👍 this looks good to me!
I have squashed commits and applied minor updates, want to check other people are happy before merging but I think we're very close

[claudep]

LGTM, thanks!