Add Documentation for Automatic Field Discovery

[ObiWanKeoni]

This adds documentation related to avo-hq/avo#3516

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🔨 Latest commit	e15e451

[Paul-Bob]

This is a solid base @ObiWanKeoni, thank you. We need to do some minor improvements before merging this PR:

• Add VersionReq object with the 3.17.0 version on top of the page.
• Use the Avo3 resource notation for all snipets for example class PostResource -> class Avo::Resources::Post
• Add a commnet with the relative path on top of each snippet, for example for the post snippet: app/avo/resources/post.rb
• Add some high lines on the important lines by adding {1,2-3} notation to each snippet (adjust the line numbers for each case}
• Remove the demo link since is leading to a 404 for now

[ObiWanKeoni]

Thank you for the speedy review @Paul-Bob!
I believe I've taken care of each of those - if you could re-review, that would be awesome

[Paul-Bob]

Looking good!

<VersionReq version="3.17.0"> was missing the closing tag: <VersionReq version="3.17.0" /> and while fixing it I changed the version requirement syntax and also added a beta version tag.

Thank you @ObiWanKeoni !