Fixes airbnb#2428.

Allow comments like:

```js
/**
 * Bla bla bla
 **/
```

Signed-off-by: Ashish Kurmi <akurmi@stepsecurity.io>

The bad example in section 15.6 (nested ternaries) used double-quoted
string literals ('"bar"', '"baz"'), which contradicts section 6.1 of
this same style guide that requires single quotes.

Also related to issue airbnb#3152 which flagged inconsistent style conventions
in code examples across sections.

Fixes the bad example to use single-quoted strings consistently with
the rest of the guide and with the good examples immediately below.

…ge` rule