Class not recognised if declared in module.exports assignment

The following code works:
```
/**
* This is an example.
*/
class Example { };
module.exports = Example;
```
The following code does not:
```
/**
* This is an example.
*/
module.exports = class Example { };
```
The second syntax is not recognised as a class declaration, so even using `@name Example` results in the class functions appearing at the root level instead of appearing inside the class. It would be nice if the second syntax was recognised as a class declaration as well!

Using documentation v8.1.2 through the CLI.