feat: enhance SciLog messaging documentation with table creation example

[wakonig]

No description provided.

[github-actions]

Remaining TODOs in the docs:

docs/how-to/devices/add-an-epics-motor.md:<!-- TODO: Add video here -->
docs/how-to/general/send-messages-to-signal.md:<!-- TODO: Uncomment once we have a better support for stickers -->
docs/getting-started/next-steps/script-gui-interactions.md:TODO: Revisit as a dedicated, safety-reviewed scripting tutorial.
docs/getting-started/quick-start/04-run-your-first-scan.md:<!-- TODO: link to learn about signals -->
docs/getting-started/quick-start/01-open-bec.md:<!-- TODO: link to different application modes. -->
docs/getting-started/quick-start/01-open-bec.md:<!-- TODO: link to information about deployments. -->

[Copilot]

🟢 Approval recommended

The changes are documentation-only and low risk, with just a minor clarity tweak suggested.

Pull request overview

This PR enhances the SciLog messaging “how-to” documentation by adding guidance and an example for creating and populating custom tables within SciLog messages from the BEC IPython client.

Changes:

• Expands the overview to explicitly include sending tables to SciLog.
• Adds a new “Build custom tables” section with an end-to-end code example and usage notes.
• Updates the closing summary text to include the new table-building capability.

File summaries

File	Description
docs/how-to/general/send-messages-to-scilog.md	Adds a custom table creation example and updates surrounding messaging guidance to reflect table support.

Review details

• Files reviewed: 1/1 changed files
• Comments generated: 1
• Review effort level: Lite

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