docs: clarify testnet faucet ETH prerequisite

[MuncleUscles]

Summary

• Add a faucet prerequisite callout to the Networks page for Bradbury and Asimov.
• Add the same note to the TestnetBradbury token setup section.
• Clarify that the 0.01 ETH balance is an anti-drain check and is not spent by the faucet.

Evidence basis

• Sanitized weekly support review found recent builder confusion about the testnet faucet requiring a wallet to hold 0.01 ETH before claiming GEN.
• The team clarified that this is expected anti-drain behavior: the ETH only needs to be present in the wallet and is not consumed.
• Existing docs linked the faucet but did not explain this prerequisite near the main faucet references.

Test plan

• pnpm build

Created by weekly docs-and-skills gap loop; draft for human review.

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