Fix malformed XML closing tag in CS9137 error documentation

[Copilot]

The CS9137 error message incorrectly showed <Features>InterceptorsPreview<Features> with duplicate opening tags instead of a proper closing tag.

Changes:

• Corrected XML syntax to <Features>InterceptorsPreview</Features> in all three occurrences (error list, detailed description, and explanation sections)

Before:

<Features>InterceptorsPreview<Features>

After:

<Features>InterceptorsPreview</Features>

Original prompt

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This section details on the original issue you should resolve

<issue_title>Code is not correct: InterceptorsPreview</issue_title>
<issue_description>### Type of issue

Code doesn't work

Description

The code under the explanation for CS9137 has an incorrect closing tag:

Current:

<Features>InterceptorsPreview<Features>

Should be:

<Features>InterceptorsPreview</Features>

Page URL

https://learn.microsoft.com/en-us/dotnet/csharp/language-reference/compiler-messages/source-generator-errors

Content source URL

https://github.com/dotnet/docs/blob/main/docs/csharp/language-reference/compiler-messages/source-generator-errors.md

Document Version Independent Id

845fd50d-3b2c-033f-05c1-0f9b37d4c512

Platform Id

f7615485-d530-c684-f92a-009bff109bed

Article author

@BillWagner

Metadata

• ID: 96a59ed5-0be2-639f-bd02-4261709f2faf
• PlatformId: f7615485-d530-c684-f92a-009bff109bed
• Service: dotnet-csharp
• Sub-service: errors-warnings

Related Issues</issue_description>

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

• Fixes Code is not correct: <Features>InterceptorsPreview<Features> #51282

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