Update dataloader explanation code #661
Merged
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Hello! I was using this recently so I thought of updating the docs.
This PR is intended to update the code example provided in the book (#518) to a newer version of the dataloader.
I also copied a bit of the explanation given in https://github.com/graphql/dataloader and created another PR to update the example repository jayy-lmao/rust-graphql-docker#5
Let me know if this is useful or if I need to change anything.