Add boolean query parser docs with accepted values

[Chucks1093]

Summary
Add boolean query parser docs with accepted values

Scope

• document accepted boolean-like query values in API docs\n- include examples for true/false/1/0 inputs\n- link docs from query validation section

Acceptance Criteria

• scoped change is implemented with no unrelated file churn
• docs/tests are updated where applicable
• contributor can validate the outcome locally

Contributor coordination: if you pick this up, reach out in Telegram for updates or clarification: https://t.me/accesslayerorg

[Bug-Hunter-X]

@Bug-Hunter-X has applied to work on this issue as part of the Stellar Wave Program's 4th wave.

please assign me this

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[harystyleseze]

@harystyleseze has applied to work on this issue as part of the Stellar Wave Program's 4th wave.

i would like to work on this

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[drips-wave]

Congratulations, @harystyleseze! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on April 29, 2026.

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[drips-wave]

This issue has been completed by @harystyleseze as part of the Stellar Wave Program's 4th Wave 🥳

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