Update documentation to include the indexer URLs

[GabrielEValenzuela]

Description

This PR updates 4.8.0 VD and indexer release notes with the latest development changes.

Checks

Docs building

• Compiles without warnings.

Writing style

• Uses present tense, active voice, and semi-formal registry.
• Uses short, simple sentences.
• Uses bold for user interface elements, italics for key terms or emphasis, and code font for Bash commands, file names, REST paths, and code.

[sebasfalcone]

LGTM!

[javimed]

@GabrielEValenzuela take a look at my previous comments above.

In the server installation guide we can get rid of the note and put its text within the very step

and rephrase it. Also, a code block example might add clarity for the user.

In the PoC guide we are simply requiring to check enabled is set to yes but we aren't mentioning anything about indexer connection. We could require to check the URL is set correctly as well.

In the upgrading guide we're warning we have an incomplete guide which won't work by itself

And refer the user to a reference page which doesn't seem to be of much guidance either.

We could expand the steps rather than putting a warning note with a link.

[GabrielEValenzuela]

Thanks @javimed ! I'm going to fix this first thing tomorrow morning!

[javimed]

@GabrielEValenzuela I added a commit with some suggestions of changes. I can modify them or revert them if you don't see them right. Please let me know if this is ok. Thanks

[GabrielEValenzuela]

I agree @javimed ! Thanks for the corrections!