Adjust docs for ethers recoverPublicKey prefixing the public key with 0x

[ranile]

Description

Update "Signing Data" with PKP docs.ethers.utils.recoverAddress returns 0x${publicKey} (lit doesn't prefix with 0x in responses to mint/sign) so the assertion from docs (recoveredPubkey === pkpInfo.publicKey) fails.

Demo: https://stackblitz.com/edit/lit-pkp-signed-pubkey-mismatch-demo?file=src%2Fmain.ts

Type of change

Documentation update

Checklist:

General

• I have performed a self-review of my code
• I have fixed all grammar issues (can use an AI tool to check), and explanations are in active voice
• I have checked the additions are concise
• Language is consistent with existing documentation
• My changes generate no new warnings
• Any dependent changes have been merged and published (ie. SDK changes, node dependencies)

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