Fix #2788: Improve description to avoid confusion about the possible …

…fixes.

src/xunit.analyzers.tests/Utility/CSharpVerifier.cs

@@ -1,4 +1,5 @@
 using System.Collections.Generic;
+using System.Globalization;
 using System.Linq;
 using System.Threading.Tasks;
 using Microsoft.CodeAnalysis;
@@ -812,6 +813,9 @@ protected TestBase(
 
 			// Diagnostics are reported in both normal and generated code
 			TestBehaviors |= TestBehaviors.SkipGeneratedCodeCheck;
+
+			// Tests that check for messages should run independent of current system culture.
+			CultureInfo.DefaultThreadCurrentUICulture = CultureInfo.InvariantCulture;
 		}
 
 		public LanguageVersion LanguageVersion { get; }

src/xunit.analyzers/Utility/Descriptors.cs

@@ -308,10 +308,10 @@ static DiagnosticDescriptor Rule(
 	public static DiagnosticDescriptor X1030_DoNotUseConfigureAwait { get; } =
 		Rule(
 			"xUnit1030",
-			"Do not call ConfigureAwait in test method",
+			"Do not call ConfigureAwait(false) in test method",
 			Usage,
 			Warning,
-			"Test methods should not call ConfigureAwait(), as it may bypass parallelization limits."
+			"Test methods should not call ConfigureAwait(false), as it may bypass parallelization limits. Omit ConfigureAwait, or use ConfigureAwait(true) to avoid CA2007."
 		);
 
 	public static DiagnosticDescriptor X1031_DoNotUseBlockingTaskOperations { get; } =