Rename section to '/rubber-duck' agent

[julienbonastre]

Why:

Closes: #45754

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

This pull request updates documentation to clarify the usage of the /rubber-duck agent command. The change improves the accuracy and consistency of the agent's naming in the documentation.

Documentation update:

• Changed the section heading from "Using the rubber duck agent" to "Using the /rubber-duck agent" in agent-sessions.md to clarify the correct slash command syntax.

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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Table of review links

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Source	Review	Production	What Changed
copilot/how-tos/github-copilot-app/agent-sessions.md	fpt ghec	fpt ghec

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[Copilot]

🟢 Approval recommended

The focused documentation change is accurate and consistent with adjacent command headings.

Pull request overview

Clarifies the rubber duck agent’s slash-command syntax.

Changes:

• Renames the section heading to use /rubber-duck.

File summaries

File	Description
content/copilot/how-tos/github-copilot-app/agent-sessions.md	Clarifies the agent command in the heading.

Review details

• Files reviewed: 1/1 changed files
• Comments generated: 0
• Review effort level: Balanced

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[subatoi]

Hi @julienbonastre, I agree the headings look a bit incongruous, but as noted at #45754 (comment), this isn't actually incorrect. As such I'm going to go ahead and close this out. Thank you very much for your interest in the GitHub docs