Improved docs

[Anon-im]

Motivation

(https://github.com/farcasterxyz/contracts/blob/main/src/IdGateway.sol)
(https://github.com/farcasterxyz/contracts/blob/main/src/KeyGateway.sol)
(https://github.com/farcasterxyz/contracts/blob/main/src/StorageRegistry.sol)

Change Summary

StorageRegistery -> StorageRegistry; inital owner -> initial owner; withan -> with an

Merge Checklist

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Additional Context

fixes #434

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PR-Codex overview

This PR focuses on correcting typos in the documentation comments and error messages across multiple Solidity files to improve clarity and accuracy.

Detailed summary

• In src/IdGateway.sol, corrected "StorageRegistery" to "StorageRegistry".
• In src/KeyGateway.sol, corrected "inital" to "initial".
• In src/StorageRegistry.sol, added a space in the comment for "invalid range".

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