Remove outdated information in the unreachable_pub lint description

Author: Urgau

compiler/rustc_lint/src/builtin.rs

@@ -1271,9 +1271,8 @@ declare_lint! {
     /// `pub(crate)` visibility is recommended to be used instead. This more clearly expresses the
     /// intent that the item is only visible within its own crate.
     ///
-    /// This lint is "allow" by default because it will trigger for a large
-    /// amount of existing Rust code, and has some false-positives. Eventually it
-    /// is desired for this to become warn-by-default.
+    /// This lint is "allow" by default because it will trigger for a large amount of existing Rust code.
+    /// Eventually it is desired for this to become warn-by-default.
     ///
     /// [`unnameable_types`]: #unnameable-types
     pub UNREACHABLE_PUB,