Updated and clarified the documentation on `.toMatch()` (#2201)
Updated and clarified the documentation on `.toMatch()` (#2201)

* Updated and clarified the documentation on `.toMatch()`.

* Update API.md

mpontus/jest,bookman25/jest,facebook/jest,ide/jest,mpontus/jest,mpontus/jest,cpojer/jest,ide/jest,skovhus/jest,skovhus/jest,bookman25/jest,skovhus/jest,facebook/jest,ide/jest,facebook/jest,bookman25/jest,cpojer/jest,cpojer/jest