NAP WAF: Missing Brute Force log variables in docs

[aknot242]

Describe the bug

When the Brute Force feature was released in NAP WAF 4.13, some log variables essential to this feature were missed from the documentation.

In summary, the $username and $login_result variables (and their descriptions) are missing from the Available Security Log Attributes section on the v4 security log and v5 security log pages.

To reproduce

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Expected behavior

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Your environment

• Version/release of this project or specific commit

• Target deployment platform

Additional context

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Sensitive Information

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