Change single fetch type override recommendation

[brophdawg11]

Closes #9330

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[pcattori]

The official docs for tsconfig types only specify @types packages as being supported. Seems like it also works for other packages/paths without @types prefix, but unclear if this is intentional or something that isn't part of the contract and could change without warning in subsequent TS releases. I think we should still go with this since its meant to be a temporary bridge for migrations/upgrades and seems extremely unlikely that TS would change this overnight without warning during this temporary period.