Function setPageSubTitle

setPageSubTitle(subTitle): void
JMap.Application.Print.setPageSubTitle

Sets the subtitle displayed in the bottom of the print layout.
Parameters
- subTitle: string
  The subtitle displayed in the bottom of the print layout
Returns void
Throws
if subTitle is not a string

Example
```
// set subtitle
JMap.Application.Print.setPageSubTitle("My custom subtitle")
```