Tweak Readme config suggestion to use cargo clean instead

README.md

@@ -157,8 +157,7 @@ lints can be configured and the meaning of the variables.
 
 Note that configuration changes will not apply for code that has already been compiled and cached under `./target/`;
 for example, adding a new string to `doc-valid-idents` may still result in Clippy flagging that string. To be sure that
-any configuration changes are applied, you may want to delete your `./target/` directory and re-compile your crate from
-scratch.
+any configuration changes are applied, you may want to run `cargo clean` and re-compile your crate from scratch.
 
 To deactivate the “for further information visit *lint-link*” message you can
 define the `CLIPPY_DISABLE_DOCS_LINKS` environment variable.