Improve sources' docs to mention '--managed-record-types'

[juan-vg]

Description

Docs are lacking info about the --managed-record-types flag, especially for the record types that are not managed by default. This change improves the sources' docs to mention this flag and also adds some CRD examples for AWS and Cloudflare (other providers should be addressed also) while warning users that some record types must be explicitly allowed to be managed.

Fixes #4831

Checklist

• Unit tests updated
• End user documentation updated

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: juan-vg / name: Juan Vela (71c5a05, ee79d0d, c9de76b, cc937a3)

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[mloiseleur]

Thanks for this PR @juan-vg
It's a good idea to provide ready-to-go examples 👍 .
Wdyt of:

1. Move "Contribution>CRD Source" to "Sources>CRD"
2. Insert example in this moved page
3. Put a link to this moved page instead of copy pasting three times the same doc block

[juan-vg]

Thanks for this PR @juan-vg It's a good idea to provide ready-to-go examples 👍 . Wdyt of:

1. Move "Contribution>CRD Source" to "Sources>CRD"

2. Insert example in this moved page

3. Put a link to this moved page instead of copy pasting three times the same doc block

That's definitely a good idea to stay DRY. However, when you refer to "Contribution>CRD Source" do you mean the tutorials?

[mloiseleur]

I mean this: https://kubernetes-sigs.github.io/external-dns/latest/docs/contributing/crd-source/

[juan-vg]

@mloiseleur done! Please let me know if there's something else I could do to improve the PR