Fix allowed contexts for reusable workflow secrets/inputs

[matiboux]

Why:

Closes: #40391

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

This updates the allowed contexts for jobs.<job_id>.secrets.<secret_id> and jobs.<job_id>.with.<input_id> in reusable-workflows.md to match the actual behavior and the documentation in contexts.md. This adds strategy, matrix, inputs, and vars to the allowed contexts for these keys, ensuring consistency.

This also renames placeholders in workflow keys in contexts.md to match those used in reusable-workflows.md, replacing <secrets_id> with <secret_id> and <with_id> with <input_id> for consistency.

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• 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.

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[Copilot]

Pull Request Overview

This PR fixes inconsistencies in the allowed contexts documentation for reusable workflow secrets and inputs in the contexts reference. It updates the allowed contexts for jobs.<job_id>.secrets.<secret_id> and jobs.<job_id>.with.<input_id> to match their actual behavior and align with the documentation in reusable-workflows.md.

Key changes:

• Removes vars, inputs, strategy, and matrix from allowed contexts for workflow secrets and inputs
• Renames parameter placeholders for consistency: <secrets_id> to <secret_id> and <with_id> to <input_id>

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Table of review links

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Source	Review	Production	What Changed
actions/reference/workflows-and-actions/contexts.md	fpt ghec ghes@ 3.17 3.16 3.15 3.14	fpt ghec ghes@ 3.17 3.16 3.15 3.14
actions/reference/workflows-and-actions/workflow-syntax.md	fpt ghec ghes@ 3.17 3.16 3.15 3.14	fpt ghec ghes@ 3.17 3.16 3.15 3.14

Key: fpt: Free, Pro, Team; ghec: GitHub Enterprise Cloud; ghes: GitHub Enterprise Server

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[matiboux]

Following new testing, this PR has been updated to consider the allowed expression contexts from contexts.md as the source of truth and resolve inconsistencies accordingly.

[Copilot]

Pull Request Overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated no new comments.