Changed LoggingConfigurationSectionName to default NLog (#520)

Author: snakefoot

src/NLog.Extensions.Logging/Logging/NLogProviderOptions.cs

@@ -72,7 +72,7 @@ public class NLogProviderOptions
         /// Checks the Host Configuration for the specified section-name, and tries to load NLog-LoggingConfiguration after creation of NLogLoggerProvider
         /// </summary>
         /// <remarks>Will only attempt to load NLog-LoggingConfiguration if valid section-name, and NLog-LoggingConfiguration has not been loaded already.</remarks>
-        public string LoggingConfigurationSectionName { get; set; }
+        public string LoggingConfigurationSectionName { get; set; } = "NLog";
 
         /// <summary>
         /// Enable additional capture of the entire <see cref="Microsoft.Extensions.Logging.EventId"/> as "EventId"-property.