Update docs.asciidoc

[BenedyMelo]

Proposed commit message

Updated the description to include a note on the first setup required permissions. When testing this with a customer, the first setup thrown the following error:

2025-02-03T19:54:05.876Z ERROR [input.httpjson-cursor] v2/input.go:115 Error while processing http request: failed to execute http client.Do: server responded with status code 403: {"error":{"code":"Forbidden","message":"Missing application roles. API required roles: Incident.Read.All,Incident.ReadWrite.All, application roles:

So I added a pharagraph to make it clear that the first setup needs some permissions to access the file system.

There was no code changes.

Checklist

• My code follows the style guidelines of this project
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have made corresponding change to the default configuration files
• I have added tests that prove my fix is effective or that my feature works
• I have added an entry in CHANGELOG.next.asciidoc or CHANGELOG-developer.next.asciidoc.

Disruptive User Impact

Customer was not aware of the permissions the Integration should have.

Author's Checklist

• [ ]

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[botelastic]

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[mergify]

This pull request does not have a backport label.
If this is a bug or security fix, could you label this PR @BenedyMelo? 🙏.
For such, you'll need to label your PR with:

• The upcoming major version of the Elastic Stack
• The upcoming minor version of the Elastic Stack (if you're not pushing a breaking change)

To fixup this pull request, you need to add the backport labels for the needed
branches, such as:

• backport-8./d is the label to automatically backport to the 8./d branch. /d is the digit
• backport-active-all is the label that automatically backports to all active branches.
• backport-active-8 is the label that automatically backports to all active minor branches for the 8 major.
• backport-active-9 is the label that automatically backports to all active minor branches for the 9 major.