docs: fix fuel specification links

FuelLabs / fuels-rs

Fuel Network Rust SDK

https://fuellabs.github.io/fuels-rs

Apache License 2.0

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Closed hal3e closed 1 month ago

hal3e commented 1 month ago

[x] I have updated the documentation.
[x] I have added necessary labels.
[x] I have done my best to ensure that my PR adheres to the Fuel Labs Code Review Standards.
[x] I have requested a review from the relevant team or maintainers.