Tiny ExitCode spelling error fixes (#250)

***NO_CI***

Author: BobbyTable

nanoFirmwareFlasher.Library/ExitCodes.cs

@@ -36,7 +36,7 @@ public enum ExitCodes
         E1002 = 1002,
 
         /// <summary>
-        /// Error flashing DFU dvice
+        /// Error flashing DFU device
         /// </summary>
         [Display(Name = "Error flashing DFU device.")]
         E1003 = 1003,
@@ -56,7 +56,7 @@ public enum ExitCodes
         /// <summary>
         /// Failed to start execution on the connected device.
         /// </summary>
-        [Display(Name = "Failed to start execition on the connected device.")]
+        [Display(Name = "Failed to start execution on the connected device.")]
         E1006 = 1006,
 
         ///////////////////////
@@ -318,7 +318,7 @@ public enum ExitCodes
         /// <summary>
         /// CLR image file has wrong format. It has to be a binary file.
         /// </summary>
-        [Display(Name = "CLR image file has wrong format.It has to be a binary file.")]
+        [Display(Name = "CLR image file has wrong format. It has to be a binary file.")]
         E9012 = 9012,
 
         /// <summary>