Fix document error. 

Remove redundant return, fix inconsistent parameter.


Also, I think 

```plain
@property (strong, nonatomic) NSArray&lt;JSONModel, ConvertOnDemand&gt;* propertyName;
```

should write like

```plain
`@property (strong, nonatomic) NSArray<JSONModel, ConvertOnDemand>* propertyName;`
```

or
```
@code
@property (strong, nonatomic) NSArray<JSONModel, ConvertOnDemand>* propertyName;
@endcode
```

But not test with appledoc yet.