Add summary to AbpApplicationCreationOptions' Configuration property.

Resolve #5794

framework/src/Volo.Abp.Core/Volo/Abp/AbpApplicationCreationOptions.cs

@@ -13,6 +13,9 @@ namespace Volo.Abp
         [NotNull]
         public PlugInSourceList PlugInSources { get; }
 
+        /// <summary>
+        /// The options in this property only take effect when IConfiguration not registered.
+        /// </summary>
         [NotNull]
         public AbpConfigurationBuilderOptions Configuration {get; }
 
@@ -23,4 +26,4 @@ namespace Volo.Abp
             Configuration = new AbpConfigurationBuilderOptions();
         }
     }
-}
+}