Document default value for diag trace level

[riQQ]

Description

Document the default value verbose for the diag trace level.

See

vstest/src/vstest.console/Processors/EnableDiagArgumentProcessor.cs

Lines 189 to 195 in 2b7cec6

	private static PlatformTraceLevel GetDiagTraceLevel(Dictionary<string, string> diagParameters)
	{
	// If diag parameters is null, set value of trace level as verbose.
	if (diagParameters == null)
	{
	return PlatformTraceLevel.Verbose;
	}

Related issue

No issue, just a documentation update.

• I have ensured that there is a previously discussed and approved issue.

[nohwnd]

Thank you :)