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Add "--select E402" to example snippet in `CONTRIBUTING.md` (#6108) 

## Summary
In Ruff only a subset of rules are enabled by default. This change
change aims to clarify that when adding a new rule, you must explicitly
use the `--select name_of_rule` command to ensure the rule gets
executed.

This was talked about on Discord a while back.

## Test Plan
Checked docs via mkdocs
This commit is contained in:
Victor Hugo Gomes 2023-07-26 19:48:53 -03:00 committed by GitHub
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commit 788643f718
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CONTRIBUTING.md
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@ -224,9 +224,12 @@ Once you've completed the code for the rule itself, you can define tests with th
For example, if you're adding a new rule named `E402`, you would run:
```shell
cargo run -p ruff_cli -- check crates/ruff/resources/test/fixtures/pycodestyle/E402.py --no-cache
cargo run -p ruff_cli -- check crates/ruff/resources/test/fixtures/pycodestyle/E402.py --no-cache --select E402
```
**Note:** Only a subset of rules are enabled by default. When testing a new rule, ensure that
you activate it by adding `--select ${rule_code}` to the command.
1. Add the test to the relevant `crates/ruff/src/rules/[linter]/mod.rs` file. If you're contributing
a rule to a pre-existing set, you should be able to find a similar example to pattern-match
against. If you're adding a new linter, you'll need to create a new `mod.rs` file (see,