Fix extra quote in JavaDoc link for EventHubClientBuilder

[Copilot]

Description

Fixes #47386

Content validation error "Extra label found: <xref" caused by malformed HTML anchor tag in EventHubClientBuilder.java JavaDoc.

Change: Removed stray quotation mark from link text.

// Before
<a href="...">Azure Identity documentation"</a>

// After  
<a href="...">Azure Identity documentation</a>

All SDK Contribution checklist:

• The pull request does not introduce [breaking changes]
• CHANGELOG is updated for new features, bug fixes or other significant changes.
• 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.

Documentation-only fix; no test coverage required.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>[Java SDK][azure-messaging-eventhubs] Extra Label</issue_title>
<issue_description>1.
ErrorInfo: Extra label found: <xref
ErrorLink: https://learn.microsoft.com/en-us/java/api/com.azure.messaging.eventhubs.eventhubclientbuilder?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-messaging-eventhubs] Extra Label #47386

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