chore(docs): Update Jest instructions for v27#31649

Merged

LekoArts merged 2 commits intogatsbyjs:masterfrom sj-rai:docs/babel-jest-createTransformer

May 31, 2021

+4-1

Commits on May 29, 2021

Update unit-testing docs according to change in Jest v27.0.0 for createTransformer
sj-rai
committed

Commits on May 31, 2021

Update unit-testing.md
LekoArts
authored