Auto merge of #3653 - gendx:master, r=phansch

Fix typos in clippy_lints/src/len_zero.rs

Some comments in the len_zero lint had typos.

clippy_lints/src/len_zero.rs

@@ -31,10 +31,10 @@
 /// ```
 /// instead use
 /// ```rust
-/// if x.len().is_empty() {
+/// if x.is_empty() {
 ///     ..
 /// }
-/// if !y.len().is_empty() {
+/// if !y.is_empty() {
 ///     ..
 /// }
 /// ```
@@ -115,8 +115,8 @@ fn check_expr(&mut self, cx: &LateContext<'a, 'tcx>, expr: &'tcx Expr) {
                     check_cmp(cx, expr.span, left, right, "", 1); // len < 1
                     check_cmp(cx, expr.span, right, left, "!", 0); // 0 < len
                 },
-                BinOpKind::Ge => check_cmp(cx, expr.span, left, right, "!", 1), // len <= 1
-                BinOpKind::Le => check_cmp(cx, expr.span, right, left, "!", 1), // 1 >= len
+                BinOpKind::Ge => check_cmp(cx, expr.span, left, right, "!", 1), // len >= 1
+                BinOpKind::Le => check_cmp(cx, expr.span, right, left, "!", 1), // 1 <= len
                 _ => (),
             }
         }