cleanup comments

Author: chenyukang

compiler/rustc_lint/src/context.rs

@@ -153,8 +153,6 @@ impl LintStore {
     pub fn get_lint_groups<'t>(
         &'t self,
     ) -> impl Iterator<Item = (&'static str, Vec<LintId>, bool)> + 't {
-        // This function is not used in a way which observes the order of lints.
-        #[allow(rustc::potential_query_instability)]
         self.lint_groups
             .iter()
             .filter(|(_, LintGroup { depr, .. })| {