Fix typos in signatureMint.md documentation

[Zentex1337]

Summary

• Fixed 'signaute' -> 'signature' in image alt text
• Fixed "recover's" -> "recovers" (removed incorrect apostrophe)

Test plan

• No functional changes, only documentation fixes
• Markdown rendering should be verified to ensure image reference works correctly

Summary by CodeRabbit

• Documentation
  • Fixed a typo in the signature minting documentation alt-text.
  • Corrected a grammatical error in the minting flow description.

[coderabbitai]

Walkthrough

Fixed typos in documentation for signature minting: corrected image alt-text filename and grammatical error in minting flow description.

Changes

Cohort / File(s)	Summary
Documentation Fixes contracts/prebuilts/token/signatureMint.md	Corrected alt-text for diagram image (typo: "signaute" → "signature") and fixed grammatical error ("recover's" → "recovers").

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately summarizes the main change: fixing typos in the signatureMint.md documentation file, which matches the two typo corrections made (alt-text and grammatical error).
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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