Added docs around IMemberPartialViewCacheInvalidator

[Migaroez]

📋 Description

New Documentation regarding the new IMemberPartialViewCacheInvalidator introduced in
umbraco/Umbraco-CMS#19314 and umbraco/Umbraco-CMS#19459

✅ Contributor Checklist

I've followed the Umbraco Documentation Style Guide and can confirm that:

• Code blocks are correctly formatted.
• Sentences are short and clear (preferably under 25 words).
• Passive voice and first-person language (“we”, “I”) are avoided.
• Relevant pages are linked.
• All links work and point to the correct resources.
• Screenshots or diagrams are included if useful.
• Any code examples or instructions have been tested.
• Typos, broken links, and broken images are fixed.

Product & Version (if relevant)

Umbraco CMS 13.9+ and 16.1+

Deadline (if relevant)

13.9 & 16.1

📚 Helpful Resources

• 🧾 Umbraco Contribution Guidelines
• ✍️ Umbraco Documentation Style Guide

[AndyButland]

Have suggested changes on the 13 - if you agree and accept them, they should be applied to the 16 one too.

Also needs a link added to the landing page at https://docs.umbraco.com/umbraco-cms/reference/cache

And a link added to the SUMMARY.md file.

[eshanrnh]

Hey @Migaroez 👋

Do we have a date for when this PR is scheduled to be merged?

Additionally, have you had a chance to review @AndyButland's's comments and suggestions? If you need assistance in addressing them, let me know, and I'll be happy to help.

[Migaroez]

Hey @eshanrnh, sorry for the delay. I have been head deep in bughunting the last few weeks. I have applied Andy's changes. If the docs team is happy with the state of the PR it can be merged in.

[eshanrnh]

No worries, @Migaroez 🙌 I have added a couple of suggestions to fix the value errors by writing shorter sentences.

[eshanrnh]

@Migaroez I have implemented Andy's suggestion in the v16 file to ensure that both versions contain the same content.

Could you add these new articles to theSummary.md file for both v13 and v16 so that it shows in the navigation on the Docs site?

[AndyButland]

@eshanrnh - sorry, I hadn't realised this was still pending with comments. Hopefully I've addressed them now for your final review. Thanks.