Fix mistakes in documentation :

- err() was meant to be employed instead of ok()
- wraps comment

clippy_lints/src/methods/err_expect.rs

@@ -19,7 +19,8 @@ pub(super) fn check(
 ) {
     if_chain! {
         if is_type_diagnostic_item(cx, cx.typeck_results().expr_ty(recv), sym::Result);
-        // Test the version to make sure the lint can be showed (expect_err has been introduced in rust 1.17.0 : https://github.com/rust-lang/rust/pull/38982)
+        // Test the version to make sure the lint can be showed (expect_err has been
+        // introduced in rust 1.17.0 : https://github.com/rust-lang/rust/pull/38982)
         if meets_msrv(msrv, &msrvs::EXPECT_ERR);
 
         // Grabs the `Result<T, E>` type

clippy_lints/src/methods/mod.rs

@@ -368,7 +368,7 @@ declare_clippy_lint! {
     /// Checks for `.err().expect()` calls on the `Result` type.
     ///
     /// ### Why is this bad?
-    /// `.expect_err()` can be called directly to avoid the extra type conversion from `ok()`.
+    /// `.expect_err()` can be called directly to avoid the extra type conversion from `err()`.
     ///
     /// ### Example
     /// ```should_panic