message: Update ExpectAPI.md
  (Typo) Removed word "to"
diff: @@ -495,7 +495,7 @@ expect.addSnapshotSerializer(serializer);
  // affects expect(value).toMatchSnapshot() assertions in the test file
  ```
  -If you add a snapshot serializer in individual test files instead of to adding it to `snapshotSerializers` configuration:
  +If you add a snapshot serializer in individual test files instead of adding it to `snapshotSerializers` configuration:
  - You make the dependency explicit instead of implicit.
  - You avoid limits to configuration that might cause you to eject from [create-react-app](https://github.com/facebookincubator/create-react-app).
  