Reworks mutation testing docs

[nunomaduro]

No description provided.

[gehrisandro]

Hi @nunomaduro

Some suggestions to improve the docs to match the used terminology.

[gehrisandro]

Suggested change

	Optionally, you may run mutation testing in parallel to speed up the process. Of course, your test suite must be able to run in tests in parallel.
	Optionally, you may run mutation testing in parallel to speed up the process. Of course, your test suite must be able to run the tests in parallel.

[gehrisandro]

Suggested change

	After running mutation testing, you will see a detailed report showing the number of mutations, how many were caught, and the mutation score.
	After running mutation testing, you will see a detailed report showing the number of mutations, how many were untested, and the mutation score.

[gehrisandro]

Suggested change

	Now, if you see "uncovered" mutations, or are a mutation score below 100%, typically means that you have **missing tests** or that **your tests are not covering all the edge cases**.
	Now, if you see "untested" mutations, or have a mutation score below 100%, typically means that you have **missing tests** or that **your tests are not covering all the edge cases**.

[gehrisandro]

Suggested change

	<a name="covered-vs-uncovered-mutations"></a>
	## Covered Vs Uncovered Mutations
	When running mutation testing, you will see two types of mutations: **covered** and **uncovered** mutations.
	- **Covered Mutations**: These are mutations that were detected by your test suite. They are considered "covered" because your tests were able to catch the changes introduced by the mutation.
	As example, the following mutation is considered "covered" because the test suite was able to detect the change.
	<a name="tested-vs-untested-mutations"></a>
	## Tested vs Untested and Uncovered Mutations
	When running mutation testing, you will see three types of mutations: **tested**, **untested** and **uncovered** mutations.
	- **Tested Mutations**: These are mutations that were detected by your test suite. They are considered "tested" because your tests were able to catch the changes introduced by the mutation.
	As example, the following mutation is considered "tested" because the test suite was able to detect the change.

[gehrisandro]

Suggested change

	- **Uncovered Mutations**: These are mutations that were not detected by your test suite. They are considered "uncovered" because your tests were not able to catch the changes introduced by the mutation.
	As example, the following mutation is considered "uncovered" because the test suite was not able to detect the change.
	- **Untested Mutations**: These are mutations that were not detected by your test suite. They are considered "untested" because your tests were not able to catch the changes introduced by the mutation.
	As example, the following mutation is considered "untested" because the test suite was not able to detect the change.

[gehrisandro]

Suggested change

	- **Uncovered Mutations**: These are mutations were no test is excuting the mutated code at all. In this case it **always** means that a test is missing.