Fix typos and formatting in documentation

[madisoncarter1234]

Fixed multiple documentation issues:

Typos:

1. casts.md: "th example" → "the example"
2. siwf/index.md: "Farcaste" → "Farcaster"
3. warpcast/api.md: "depracated" → "deprecated"
4. messages.md: "channels emoji" → "channels, and emoji"

Formatting:
5. verify-address.md: Added missing space after comma in link list

Link Consistency:
6. developers/index.md: Removed .md extensions from internal links for consistency

All simple text corrections to improve documentation quality.

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PR-Codex overview

This PR focuses on improving documentation clarity and correcting minor typographical errors across various Markdown files related to the Farcaster project.

Detailed summary

• Corrected the demo name from Sign In with Farcaste to Sign In with Farcaster.
• Added a comma in a sentence about creating casts.
• Fixed the spelling of deprecated.
• Removed an extra line break in the Ethereum provider URL description.
• Updated links to remove .md extensions for consistency.
• Corrected the spelling of th example to the example.

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[manan19]

@copilot resolve conflicts

[Copilot]

Pull request overview

This PR improves documentation quality across the Farcaster docs site by correcting typos, small punctuation issues, and normalizing internal link style.

Changes:

• Fixed multiple spelling/wording issues across developer and reference docs.
• Improved readability with minor punctuation/spacing tweaks.
• Updated internal AuthKit links to match the site’s clean URL style (no .md extension).

Reviewed changes

Copilot reviewed 5 out of 6 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
docs/reference/warpcast/api.md	Corrects “depracated” → “deprecated” in the account verifications endpoint note.
docs/developers/siwf/index.md	Fixes “Farcaste” → “Farcaster” in the SIWF demo image alt text.
docs/developers/index.md	Removes .md from AuthKit internal links for clean URL consistency.
docs/developers/guides/writing/verify-address.md	Adds missing space after comma between provider links for readability.
docs/developers/guides/writing/messages.md	Adds commas for clearer list punctuation (“channels, and emoji”).
docs/developers/guides/writing/casts.md	Fixes “th example” → “the example”.

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