add IsAzureAppConfigurationSource extension

src/Microsoft.Extensions.Configuration.AzureAppConfiguration/ConfigurationSourceExtensions.cs

@@ -0,0 +1,22 @@
+// Copyright (c) Microsoft Corporation.
+// Licensed under the MIT license.
+//
+
+namespace Microsoft.Extensions.Configuration.AzureAppConfiguration
+{
+    /// <summary>
+    /// Provides extension methods for configuration sources.
+    /// </summary>
+    public static class ConfigurationSourceExtensions
+    {
+        /// <summary>
+        /// Determines whether the specified configuration source is an Azure App Configuration source.
+        /// </summary>
+        /// <param name="source">The configuration source to check.</param>
+        /// <returns>true if the specified source is an Azure App Configuration source; otherwise, false.</returns>
+        public static bool IsAzureAppConfigurationSource(this IConfigurationSource source)
+        {
+            return source is AzureAppConfigurationSource;
+        }
+    }
+}

src/Microsoft.Extensions.Configuration.AzureAppConfiguration/RequestTracingOptions.cs

@@ -66,7 +66,7 @@ internal class RequestTracingOptions
         /// <summary>
         /// Checks whether any tracing feature is used.
         /// </summary>
-        /// <returns>True if any tracing feature is used, otherwise false.</returns>
+        /// <returns>true if any tracing feature is used, otherwise false.</returns>
         public bool UsesAnyTracingFeature()
         {
             return IsLoadBalancingEnabled || IsSignalRUsed;