Remove invalid validations section for checkboxes

[revolter]

Why:

Adding a validations key to a checkboxes type body element causes an error.

Closes:

What's being changed (if available, include any code snippets, screenshots, or gifs):

Check off the following:

• A subject matter expert (SME) has reviewed the technical accuracy of the content in this PR. In most cases, the author can be the SME. Open source contributions may require an SME review from GitHub staff.
• The changes in this PR meet the docs fundamentals that are required for all content.
• All CI checks are passing and the changes look good in the review environment.

[github-actions]

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Source	Review	Production	What Changed
communities/using-templates-to-encourage-useful-issues-and-pull-requests/syntax-for-githubs-form-schema.md	fpt ghec ghes@ 3.18 3.17 3.16 3.15 3.14	fpt ghec ghes@ 3.18 3.17 3.16 3.15 3.14

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[Copilot]

Pull Request Overview

This PR removes a duplicate "Validations for checkboxes" section from the form schema syntax documentation. The removal correctly eliminates redundant documentation structure that was repeating validation information.

Key Changes

• Removes duplicate "Validations for checkboxes" section (lines 248-256) that contained a validation table header and structure

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[Sharra-writes]

@revolter Thanks for opening a PR! I will figure out who knows enough about this to verify and let you know!