Update comment regarding crate level cfg_attr

Author: phansch

clippy_lints/src/lib.rs

@@ -260,8 +260,8 @@ mod reexport {
 ///
 /// Pre-expansion lints run before any macro expansion has happened.
 ///
-/// Note that due to the architechture of the compiler, currently `cfg_attr` attributes will still
-/// be expanded even when using a pre-expansion pass.
+/// Note that due to the architechture of the compiler, currently `cfg_attr` attributes on crate
+/// level (i.e `#![cfg_attr(...)]`) will still be expanded even when using a pre-expansion pass.
 ///
 /// Used in `./src/driver.rs`.
 pub fn register_pre_expansion_lints(