Fixes several typos

[benediktjohannes]

Hope this helps a bit 👍 @ericspod Thanks as always for reviewing!

[coderabbitai]

📝 Walkthrough

Walkthrough

This PR fixes typos across three files: correcting "defauting" to "defaulting" in docstrings across multiple writer classes in monai/data/image_writer.py, and fixing "transfrom" to "transform" in test comments in tests/data/test_cachedataset.py and tests/data/test_smartcachedataset.py. All changes are cosmetic with no functional impact.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

🚥 Pre-merge checks | ✅ 1 | ❌ 2

❌ Failed checks (2 warnings)

Check name	Status	Explanation	Resolution
Description check	⚠️ Warning	The description lacks required sections like issue reference, detailed change description, and types of changes checklist from the template.	Add missing template sections: reference the issue, provide a detailed description of changes, and complete the types of changes checklist.
Docstring Coverage	⚠️ Warning	Docstring coverage is 75.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (1 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title 'Fixes several typos' accurately and concisely summarizes the main changes across multiple files.

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✨ Finishing touches

• 📝 Generate docstrings

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[ericspod]

Thanks!