Docs fixes

[consensuslayer]

Hello Farcaster team

While reading the docs (not all but a part of them)

I found some typos and I fixed those.

Best

CL>

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PR-Codex overview

This PR focuses on correcting grammatical errors and enhancing clarity in various documentation files related to the Farcaster platform.

Detailed summary

• Changed "farcaster username" to "Farcaster username" in register-ens.md.
• Corrected "associated" to "associates" in hello-world.md.
• Added "a" in "a custody address" in change-custody.md.
• Changed "loads" to "loaded" in best-practices.md.
• Added a hyphen in "human-readable" in feed.md.
• Corrected "us" to "use" in create-account-key.md.
• Added "that" in "request that the user" in spec.md.
• Corrected "th example" to "the example" in casts.md.
• Changed "sign in request" to "sign-in request" in create-channel.md.
• Changed "sign in link" to "sign-in link" in use-sign-in.md.
• Changed "sign in component" to "sign-in component" in use-sign-in.md.
• Changed "sign in is complete" to "sign-in is complete" in use-sign-in.md.

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[vercel]

@consensuslayer is attempting to deploy a commit to the farcaster Team on Vercel.

A member of the Team first needs to authorize it.

[zacharytyhacz]

LGTM