[Search] Add samples authoring reference to azure-search-documents skill

[hizixin]

Description

Please add an informative description that covers that changes made by the pull request and link all relevant issues.

If an SDK is being regenerated based on a new API spec, a link to the pull request containing these API spec changes should be included above.

All SDK Contribution checklist:

• The pull request does not introduce [breaking changes]
• CHANGELOG is updated for new features, bug fixes or other significant changes.
• I have read the contribution guidelines.

General Guidelines and Best Practices

• Title of the pull request is clear and informative.
• There are a small number of commits, each of which have an informative message. This means that previously merged commits do not appear in the history of the PR. For more information on cleaning up the commits in your PR, see this page.

Testing Guidelines

• Pull request includes test coverage for the included changes.

[Copilot]

Pull request overview

This PR extends the package-specific GitHub skill for azure-search-documents by adding a new references/samples.md sidecar that documents the live-run setup and the mandatory checklist for authoring/updating samples, and links to it from the skill's "Additional references" list. It mirrors the existing sidecar pattern already used by references/release.md and references/testing.md, and its guidance aligns with the conventions of the package's newer preview samples (DESCRIPTION/USAGE docstrings, run_tag-based resource names, # [START]/# [END] tags, sample_utils.py helpers, and sync/async pairing).

Changes:

• Added a new references/samples.md sidecar describing live-sample environment setup and a 6-item sample authoring checklist.
• Linked the new sidecar from SKILL.md's "Additional references" section.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
sdk/search/azure-search-documents/.github/skills/azure-search-documents/SKILL.md	Adds a bullet referencing the new references/samples.md sidecar.
sdk/search/azure-search-documents/.github/skills/azure-search-documents/references/samples.md	New sidecar documenting live-run setup and the sample authoring checklist.

The content is internally consistent and matches existing sample patterns. The one observation is a nit: unlike the testing sidecar, the new samples sidecar tells users to "create" the live-env script without providing an analogous committed Set-LiveSampleEnvironment.sample.ps1 template to copy from.