docs(paths-mapping): Fixed broken guide for paths mapping helper #3894
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Summary
Hi! I'm a newcomer to ts-jest, had a problem setting up test environment for my project using this library.
TypeScript Alias using tsconfig.json didn't work in test files.
I was wondering for around 30 minutes and found the answer from the Issue's comment - which was at the bottom of the page. It seemed really hard to find the information.
This PR provides "helper" part of "Paths Mapping" documentation page the missing code.
As this Issue's comment states, the documentation should state as follows to make jest config work with aliases from tsconfig:
FYI, the documentation was as follows(as you can see from commit):
Test plan
Not needed.
Does this PR introduce a breaking change?
Other information
None.