filter_parser: Add new param to doc

[Athishpranav2003]

Addresses feature added in fluent/fluent-bit#9274

[eschabell]

@Athishpranav2003 can you resolve the conflicts here as the code PR fluent/fluent-bit#9274 got a nudge from me today, hoping to clear this up soon?

[eschabell]

Went ahead and fixed the conflict.

[coderabbitai]

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

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Run ID: 0f8806d5-c23d-4ffa-83ad-92c056809952

📥 Commits

Reviewing files that changed from the base of the PR and between 5231934 and a6ffb95.

📒 Files selected for processing (1)

• pipeline/filters/parser.md

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🧪 Generate unit tests (beta)

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