Fix duplicate azure_subscription link in azure-health-insights-radiologyinsights README

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Description

Fixes "Extra label found: <xref" content validation error in RadiologyInsightsClient and RadiologyInsightsAsyncClient API docs.

Root cause: README.md contained duplicate [azure_subscription] link definitions at lines 980 and 1000.

Fix: Removed the duplicate definition at line 1000.

Fixes #47385

All SDK Contribution checklist:

• The pull request does not introduce [breaking changes]
• CHANGELOG is updated for new features, bug fixes or other significant changes. (N/A - documentation only)
• 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. (N/A - documentation only)

Original prompt

---

This section details on the original issue you should resolve

<issue_title>[Java SDK][azure-health-insights-radiologyinsights] Extra Label</issue_title>
<issue_description>1.
ErrorInfo: Extra label found: <xref
ErrorLink: https://learn.microsoft.com/en-us/java/api/com.azure.health.insights.radiologyinsights.radiologyinsightsasyncclient?view=azure-java-stable&branch=main
ErrorLocation:

• Appears 1 times , label : <xref

ErrorInfo: Extra label found: <xref
ErrorLink: https://learn.microsoft.com/en-us/java/api/com.azure.health.insights.radiologyinsights.radiologyinsightsclient?view=azure-java-stable&branch=main
ErrorLocation:

• Appears 1 times , label : <xref

</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes [Java SDK][azure-health-insights-radiologyinsights] Extra Label #47385

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Pull request overview

This PR fixes a documentation validation error caused by duplicate link definitions in the README file. The duplicate [azure_subscription] reference was causing "Extra label found: <xref" errors in the API documentation for RadiologyInsightsClient and RadiologyInsightsAsyncClient.

• Removed duplicate [azure_subscription] link definition at line 1000
• The original definition at line 980 remains intact
• This resolves content validation errors in API documentation

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