Remove Edition 2018 tests section from adding lints doc

The UI tests now use the latest edition by default. Testing on older
editions should almost never be necessary, so I don't see a need to
document this.
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flip1995 2022-01-21 17:29:18 +01:00 committed by Philipp Krones
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@ -147,13 +147,6 @@ the tests.
[rustfix]: https://github.com/rust-lang/rustfix
## Edition 2018 tests
Some features require the 2018 edition to work (e.g. `async_await`), but
compile-test tests run on the 2015 edition by default. To change this behavior
add `// edition:2018` at the top of the test file (note that it's
space-sensitive).
## Testing manually
Manually testing against an example file can be useful if you have added some