Fixed code for WebResourceResponseReceived event

[mikehoffms]

Rendered article section for review:
https://review.learn.microsoft.com/en-us/microsoft-edge/webview2/how-to/webresourcerequested?branch=pr-en-us-2756&tabs=dotnet#example-monitoring-the-requests-and-responses-via-the-webresourceresponsereceived-event - first line of code for .NET

This PR fixes #2752

This PR makes the following changes:

• Changes 1 line of code.
• Applies h2/h4/h6 pattern, h5 for tabs.

AB#45827966

[learn-build-service-prod]

Learn Build status updates of commit cd29625:

✅ Validation status: passed

File	Status	Preview URL	Details
microsoft-edge/webview2/how-to/webresourcerequested.md	✅Succeeded	View

For more details, please refer to the build report.

For any questions, please:

• Try searching the learn.microsoft.com contributor guides
• Post your question in the Learn support channel

[learn-build-service-prod]

Learn Build status updates of commit 19b42a6:

✅ Validation status: passed

File	Status	Preview URL	Details
microsoft-edge/webview2/how-to/webresourcerequested.md	✅Succeeded	View

For more details, please refer to the build report.

For any questions, please:

• Try searching the learn.microsoft.com contributor guides
• Post your question in the Learn support channel