[Docs] Required permissions under AWS custom logs

[octavioranieri]

Currently we only mention the required permissions under the parent AWS integration, which would cover all the AWS integrations:
https://www.elastic.co/docs/current/integrations/aws#aws-permissions

Users may need more granular of what’s required for the specifics instead of having all the permissions.

AWS custom logs docs should have the specific required permissions, similar to the Filebeat module:
https://www.elastic.co/guide/en/beats/filebeat/current/filebeat-input-aws-s3.html#_aws_permissions_2

[lucabelluccini]

The request here could be expanded further, where we should have a way to include the documentation associated to a specific input in all integrations using it.

E.g. aws-s3 input is used in several integrations (O11y & Security owned) and in all of them generally the settings and prerequisites are similar.

[lucabelluccini]

FYI @alaudazzi / @eedugon do you know what might be the best way to put this under the radar?

[alaudazzi]

@lucabelluccini Thanks for raising this! It makes sense to provide more granular info where needed and consolidate similar settings to facilitate discoverability. I can follow up on this ticket.