Update Gas API docs with secret-less call option

MetaMask / metamask-docs

Developer documentation for MetaMask

https://docs.metamask.io

Apache License 2.0

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Update Gas API docs with secret-less call option #1345

Closed alexandratran closed 4 weeks ago

alexandratran commented 1 month ago

Add instructions on how to call the Gas API without requiring an API key secret. Make similar changes as in the equivalent Infura docs (see https://github.com/INFURA/docs/pull/234).

Also, update code samples in this section to use two-space indents.