Fixing typo in error handling
Fixing typo in error handling

`RescueFrom` is used in the class definition but `Rescuable` is used in the sample use case.
Updated class definition to use `Rescuable`
rmosolgo/graphql-ruby,nevesenin/graphql-ruby,xuorig/graphql-ruby,xuorig/graphql-ruby,rmosolgo/graphql-ruby,xuorig/graphql-ruby,nevesenin/graphql-ruby,rmosolgo/graphql-ruby,nevesenin/graphql-ruby,nevesenin/graphql-ruby,rmosolgo/graphql-ruby