Clarify guidance for first-time contributors

[KritikaJoshi22]

Summary

Adds a small clarification to the “Minor changes to documentation” section to help first-time contributors better understand when this contribution path is appropriate.

Type of change

• Minor documentation improvement

Related context

Sample PR created to demonstrate Microsoft Learn contribution workflow.

[learn-build-service-prod]

Learn Build status updates of commit 71aa8d7:

✅ Validation status: passed

File	Status	Preview URL	Details
Contribute/content/how-to-write-overview.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 and severity-2 issues. 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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