Update some documentation

Author: flip1995

doc/adding_lints.md

@@ -191,15 +191,15 @@ declare_lint_pass!(FooFunctions => [FOO_FUNCTIONS]);
 impl EarlyLintPass for FooFunctions {}
 ```
 
-Don't worry about the `name` method here. As long as it includes the name of the
-lint pass it should be fine.
-
-The new lint automation runs `update_lints`, which automates some things, but it
-doesn't automate everything. We will have to register our lint pass manually in
-the `register_plugins` function in `clippy_lints/src/lib.rs`:
+After declaring the lint, you have to run `cargo dev update_lints`, which
+updates some files, so Clippy knows about the new lint. If you used `cargo dev
+new_lint ...` to declare the lint, this was done automatically. While
+`update_lints` automates most of the things, it doesn't automate everything. We
+will have to register our lint pass manually in the `register_plugins` function
+in `clippy_lints/src/lib.rs`:
 
 ```rust
-reg.register_early_lint_pass(box foo_functions::FooFunctions);
+store.register_early_pass(box foo_functions::FooFunctions);
 ```
 
 This should fix the `unknown clippy lint: clippy::foo_functions` error that we