Function setContextTitle

setContextTitle(contextId, title): Promise<void>
JMap.MapContext.setContextTitle

Updates a map context title, without changing the map data.

The map-context title is persisted server-side.
Parameters
- contextId: JId
  the JMap map context id
- title: string
  the new title
Returns Promise<void>
Throws
if context not found, or empty title, or server request error

Example
```
// update the map-context id=3 title
JMap.MapContext
   .setContextTitle(3, "My new title")
   .then(() => console.info(`Map context id=3 "title" updated`))
   .catch(error => console.error(error))
```