[Documentation] Improve automock/add note to automock

[michaelw85]

Automock's default value is false, which gave me the expectation nothing is mocked at all.

For my project I started adding mocks at root level and manually calling jest.mock('a_node_module') which worked fine at first until I had a test where I did not explicitly called jest.mock but still ended up with a mocked version.
It took me a while to find this documentation

If the module you are mocking is a Node module (e.g.: lodash), the mock should be placed in the mocks directory adjacent to node_modules (unless you configured roots to point to a folder other than the project root) and will be automatically mocked. There's no need to explicitly call jest.mock('module_name').

It would be nice to add a reference to this piece of documentation or add an additional "note" to automock.

[SimenB]

Wanna send a PR for that? :)

[michaelw85]

@SimenB Create (my first jest 🎉) PR to improve docs.

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