docs: add DefaultTraceListener entry to trace listeners table

[abhiramch018]

Summary

Added the missing DefaultTraceListener entry to the trace listeners table in the .NET Framework configuration documentation.

Why

The table listing available trace listener classes did not include DefaultTraceListener, which caused confusion for users trying to configure it using app.config. This listener is automatically included by default in the Trace.Listeners collection, but users may want to reference it explicitly in configuration files.

Change

• Added a new row for DefaultTraceListener to the trace listener table in add-element-for-listeners-for-trace.md.
• Clarified its purpose and default behavior in debugging and tracing scenarios.

Related Issue

Fixes #48559

Summary

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Fixes #Issue_Number (if available)

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Internal previews

📄 File	🔗 Preview link
docs/framework/configure-apps/file-schema/trace-debug/add-element-for-listeners-for-trace.md	<add> Element for <listeners> for <trace>