[SKIP CI] fix: add file_read documentation to audit log docu

[schweigisito]

Description

This PR adds the missing file_read operation within the audit service documemtation.

Related Issue

There has not been created any issue.

Motivation and Context

Enhance/fix documentation

How Has This Been Tested?

Verified actual behaviour of activated audit.log and enhance documentation.

Screenshots (if appropriate):

N/A

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Technical debt
• Tests only (no source changes)
• Updated documentation

Checklist:

• Code changes
• Unit tests added
• Acceptance tests added
• Documentation added

[codacy-production]

Not up to standards ⛔

🔴 Issues 1 minor

Alerts:
⚠ 1 issue (≤ 0 issues of at least minor severity)

Results:
1 new issue

Category	Results
CodeStyle	1 minor

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