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Derive explanation method on Rule struct via rustdoc (#2642)

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```console
❯ cargo run rule B017
    Finished dev [unoptimized + debuginfo] target(s) in 0.13s
     Running `target/debug/ruff rule B017`
no-assert-raises-exception

Code: B017 (flake8-bugbear)

### What it does
Checks for `self.assertRaises(Exception)`.

## Why is this bad?
`assertRaises(Exception)` can lead to your test passing even if the
code being tested is never executed due to a typo.

Either assert for a more specific exception (builtin or custom), use
`assertRaisesRegex` or the context manager form of `assertRaises`.
```
This commit is contained in:
Charlie Marsh 2023-02-07 17:23:29 -05:00 • committed by GitHub
parent 8fd29b3b60
commit f1cdd108e6
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262 changed files with 400 additions and 537 deletions
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1
crates/ruff_dev/src/generate_docs.rs Normal file
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@ -0,0 +1 @@

7
crates/ruff_dev/src/main.rs
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@ -2,8 +2,12 @@
//!
//! Within the ruff repository you can run it with `cargo dev`.
use anyhow::Result;
use clap::{Parser, Subcommand};
mod generate_all;
mod generate_cli_help;
mod generate_docs;
mod generate_json_schema;
mod generate_options;
mod generate_rules_table;
@ -13,9 +17,6 @@ mod print_tokens;
mod round_trip;
mod utils;
use anyhow::Result;
use clap::{Parser, Subcommand};
const ROOT_DIR: &str = concat!(env!("CARGO_MANIFEST_DIR"), "/../../");
#[derive(Parser)]