Improving intellisense by fixing XML warnings

[nikcio]

Prerequisites

• I have added steps to test this contribution in the description below

Description

This fixes many of the XML warnings that are in the project. Many of the warnings broke the comment so it wasn't displayed anywhere. It was mostly legacy documentation that wasn't updated correctly and & that wasn't escaped correctly.

Note I added some white space to: src/Umbraco.Infrastructure/WebAssets/ServerVariables.js because placing the // right up against the generated XML comment in the designer file breaks the XML comment.

This shouldn't affect any of the actual code only the XML comments.

[github-actions]

Hi there @nikcio, thank you for this contribution! 👍

While we wait for one of the Core Collaborators team to have a look at your work, we wanted to let you know about that we have a checklist for some of the things we will consider during review:

• It's clear what problem this is solving, there's a connected issue or a description of what the changes do and how to test them
• The automated tests all pass (see "Checks" tab on this PR)
• The level of security for this contribution is the same or improved
• The level of performance for this contribution is the same or improved
• Avoids creating breaking changes; note that behavioral changes might also be perceived as breaking
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• 💡 The contribution looks original and the contributor is presumably allowed to share it

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If you realize that you might want to make some changes then you can do that by adding new commits to the branch you created for this work and pushing new commits. They should then automatically show up as updates to this pull request.

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[mikecp]

Hi @nikcio,
Thanks for this clean-up, together with your PR #14664, it makes an impressive amount of files updates 👍
We'll handle them asap!
Cheers!

[lauraneto]

Hi @nikcio ,

Thanks a lot for this pull request! So many files 🫣, but lots of good fixes!

I ended up reverting your commit docs: Fix XML in resource designer because the truth is... the generator is the one at fault here, and not the original file. Ideally we would just ignore warnings in auto-generated files, so maybe an idea for a next PR! 😁

Thanks again for the great work! 🙌