fix indentation in docs

Author: antonilol

clippy_lints/src/attrs/mod.rs

@@ -310,8 +310,8 @@ declare_clippy_lint! {
     /// ```rust,ignore
     /// #[allow(unused_mut)]
     /// fn foo() -> usize {
-    ///    let mut a = Vec::new();
-    ///    a.len()
+    ///     let mut a = Vec::new();
+    ///     a.len()
     /// }
     /// ```
     /// Use instead:

clippy_lints/src/operators/mod.rs

@@ -80,7 +80,7 @@ declare_clippy_lint! {
     /// ```no_run
     /// // `n` can be any number, including `i32::MAX`.
     /// fn foo(n: i32) -> i32 {
-    ///   n + 1
+    ///     n + 1
     /// }
     /// ```
     ///