Fix builtin lints

Author: compiler-errors

compiler/rustc_lint/src/builtin.rs

@@ -998,10 +998,8 @@ declare_lint! {
     /// ### Example
     ///
     /// ```rust
-    /// #[no_mangle]
-    /// fn foo<T>(t: T) {
-    ///
-    /// }
+    /// #[unsafe(no_mangle)]
+    /// fn foo<T>(t: T) {}
     /// ```
     ///
     /// {{produces}}

compiler/rustc_lint/src/foreign_modules.rs

@@ -35,12 +35,12 @@ declare_lint! {
     ///
     /// ```rust
     /// mod m {
-    ///     extern "C" {
+    ///     unsafe extern "C" {
     ///         fn foo();
     ///     }
     /// }
     ///
-    /// extern "C" {
+    /// unsafe extern "C" {
     ///     fn foo(_: u32);
     /// }
     /// ```

compiler/rustc_lint/src/types.rs

@@ -923,7 +923,7 @@ declare_lint! {
     /// ### Example
     ///
     /// ```rust
-    /// extern "C" {
+    /// unsafe extern "C" {
     ///     static STATIC: String;
     /// }
     /// ```

compiler/rustc_lint_defs/src/builtin.rs

@@ -2881,7 +2881,7 @@ declare_lint! {
     ///
     /// ```rust
     /// enum Void {}
-    /// extern {
+    /// unsafe extern {
     ///     static EXTERN: Void;
     /// }
     /// ```
@@ -4147,7 +4147,7 @@ declare_lint! {
     /// ```rust
     /// #![warn(ffi_unwind_calls)]
     ///
-    /// extern "C-unwind" {
+    /// unsafe extern "C-unwind" {
     ///     fn foo();
     /// }
     ///
@@ -4888,7 +4888,7 @@ declare_lint! {
     ///
     /// ### Example
     ///
-    /// ```rust
+    /// ```rust,edition2021
     /// #![warn(missing_unsafe_on_extern)]
     /// #![allow(dead_code)]
     ///
@@ -4925,7 +4925,7 @@ declare_lint! {
     ///
     /// ### Example
     ///
-    /// ```rust
+    /// ```rust,edition2021
     /// #![warn(unsafe_attr_outside_unsafe)]
     ///
     /// #[no_mangle]