Function setContextDescription

setContextDescription(contextId, description): Promise<void>
JMap.MapContext.setContextDescription

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

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

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