Update migration_style_guide.md
What does this MR do and why?
Adjust terminology: migration -> transaction.
Based on this suggestion: !67295 (comment 678781033)
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.
Edited by Alishan Ladhani