Updated pymc.model.transform.conditioning.do docstring

[JeanVanDyk]

Description

Added spaces between argument's name and its colon.

Related Issue

• [x] Closes #
• [x ] Related to #5459

Checklist

• [x ] Checked that the pre-commit linting/style checks pass
• [ ] Included tests that prove the fix is effective or that the new feature works
• [ ] Added necessary documentation (docstrings and/or example notebooks)
• [ ] If you are a pro: each commit corresponds to a relevant logical change

Type of change

• [ ] New feature / enhancement
• [ ] Bug fix
• [ ] Documentation
• [ x] Maintenance
• [ ] Other (please specify):

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📚 Documentation preview 📚: https://pymc--7782.org.readthedocs.build/en/7782/

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