Remove default value description for FileNumber parameter in Restore-SqlDscDatabase

Author: johlju

source/Public/Restore-SqlDscDatabase.ps1

@@ -59,7 +59,7 @@
 
     .PARAMETER FileNumber
         Specifies the backup set number to restore when the backup file contains
-        multiple backup sets. Default is 1.
+        multiple backup sets.
 
     .PARAMETER ToPointInTime
         Specifies a point in time to restore the database to. This parameter