[readne] Add note to Whitespace section on removing trailing whitespace

Author: unkillbob

README.md

@@ -3029,6 +3029,22 @@ Other Style Guides
   <a name="whitespace--no-trailing-spaces"></a>
   - [19.19](#whitespace--no-trailing-spaces) Avoid trailing spaces at the end of lines. eslint: [`no-trailing-spaces`](https://eslint.org/docs/rules/no-trailing-spaces)
 
+    ```javascript
+    // bad
+    function() {∙∙
+      var name;
+    ∙∙
+      // ... stuff ...
+    }
+
+    // good
+    function() {
+      var name;
+
+      // ... stuff ...
+    }
+    ```
+
   <a name="whitespace--no-multiple-empty-lines"></a>
   - [19.20](#whitespace--no-multiple-empty-lines) Avoid multiple empty lines, only allow one newline at the end of files, and avoid a newline at the beginning of files. eslint: [`no-multiple-empty-lines`](https://eslint.org/docs/rules/no-multiple-empty-lines)