Fixes typos in fine-tuning contrib README

[skrawcz]

For new dataflows:

N/A

For existing dataflows -- what has changed?

• Fixes typos in README

How I tested this

N/A

Notes

Checklist

• PR has an informative and human-readable title (this will be pulled into the release notes)
• Changes are limited to a single goal (no scope creep)
• Code passed the pre-commit check & code is left cleaner/nicer than when first encountered.
• Any change in functionality is tested
• New functions are documented (with a description, list of inputs, and expected output)
• Dataflow documentation has been updated if adding/changing functionality.