[DOC] Typo in JSON API example code

[fleborne]

Insert the documentation link:
https://www.luos.io/docs/tools/api-json#custom-parameters-and-specific-messages

Describe the issue or the suggestion:

The following snippet is wrong:

def sendCmd(s, cmd, sleep_time=0.5):
    cmd = cmd + '\network'

How would you fix the issue / which content would you add or delete?

def sendCmd(s, cmd, sleep_time=0.5):
    cmd = cmd + '\n'

[Simonbdy]

Thanks @fleborne.

@Salem-Tho could you have a look to confirm the proposed solution? Thank you