Update AlarmDto.cs to fix typo

Update AlarmDto.cs to fix typo

IoTSharp.Contracts/AlarmDto.cs

@@ -23,7 +23,7 @@ namespace IoTSharp.Contracts
         public string AlarmDetail { get; set; }
 
         /// <summary>
-        /// 严重成都
+        /// 严重程度
         /// </summary>
         public ServerityLevel Serverity { get; set; } = ServerityLevel.Indeterminate;
 
@@ -81,7 +81,7 @@ namespace IoTSharp.Contracts
         public AlarmStatus AlarmStatus { get; set; }
 
         /// <summary>
-        /// 严重成都
+        /// 严重程度
         /// </summary>
         public ServerityLevel Serverity { get; set; }
 
@@ -113,4 +113,4 @@ namespace IoTSharp.Contracts
     }
 
     
-}
\ No newline at end of file
+}