Added critical documentation about using separate 'Closes' lines for PR merge commits:
- Explains why single-line multiple issue references fail
- Provides correct multi-line format examples
- Prevents common issue where only first issue gets closed
- Updates usage examples with proper multi-issue syntax
This fixes the issue we encountered where 'Closes #4, #5, #6' only closed#4.
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Co-Authored-By: Mistral Vibe <vibe@mistral.ai>