Add shell integration instructions for Fish Shell

[ocean-sudo]

Added a new section for Fish shell integration, including a general setup and a specific guide for Starship users. The script is tested and follows the style of existing documentation.

[learn-build-service-prod]

Learn Build status updates of commit 4e3423e:

⚠️ Validation status: warnings

File	Status	Preview URL	Details
TerminalDocs/tutorials/shell-integration.md	⚠️Warning	View	Details

TerminalDocs/tutorials/shell-integration.md

• Line 321, Column 1: [Warning: multiple-h1s - See documentation] Multiple H1s(H1 'Fish') are not allowed. You can only have one top-level heading.

For more details, please refer to the build report.

Note: Your PR may contain errors or warnings or suggestions unrelated to the files you changed. This happens when external dependencies like GitHub alias, Microsoft alias, cross repo links are updated. Please use these instructions to resolve them.

[learn-build-service-prod]

PoliCheck Scan Report

The following report lists PoliCheck issues in PR files. Before you merge the PR, you must fix all severity-1 issues. Other issues are also a high priority. The AI Review Details column lists suggestions for either removing or replacing the terms. If you find a false positive result, mention it in a PR comment and include this text: #policheck-false-positive. This feedback helps reduce false positives in future scans.

✅ No issues found

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Information: PoliCheck | Severity Guidance | Term
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[ocean-sudo]

@microsoft-github-policy-service agree

[learn-build-service-prod]

Learn Build status updates of commit 3c245e8:

✅ Validation status: passed

File	Status	Preview URL	Details
TerminalDocs/tutorials/shell-integration.md	✅Succeeded	View

For more details, please refer to the build report.

[learn-build-service-prod]

PoliCheck Scan Report

The following report lists PoliCheck issues in PR files. Before you merge the PR, you must fix all severity-1 issues. Other issues are also a high priority. The AI Review Details column lists suggestions for either removing or replacing the terms. If you find a false positive result, mention it in a PR comment and include this text: #policheck-false-positive. This feedback helps reduce false positives in future scans.

✅ No issues found

More information about PoliCheck

Information: PoliCheck | Severity Guidance | Term
For any questions: Try searching the learn.microsoft.com contributor guides or post your question in the Learn support channel.