Correct arduino-iot-cloud package name in installation command

Arduino provides a Arduino IoT Cloud client Python package to allow interfacing with Arduino IoT Cloud objects from a
Python script.

The documentation for the package includes a command that can be used to install the package on the host PC. Previously,
the command used an incorrect name for the package, which caused the command to fail:

```
$ pip install arduino-iot-cloud-py
ERROR: Could not find a version that satisfies the requirement arduino-iot-cloud-py (from versions: none)
ERROR: No matching distribution found for arduino-iot-cloud-py
```

The package name in the installation command is hereby corrected.

Author: per1234

content/arduino-cloud/01.getting-started/10.manual-device/manual-devices.md

@@ -148,7 +148,7 @@ The pre-requisities for connecting with Python is:
 Connection to the cloud via Python uses the same API as the MicroPython example listed in this article. To install the [arduino-iot-cloud-py](https://github.com/arduino/arduino-iot-cloud-py) module, we can use `pip`.
 
 ```py
-pip install arduino-iot-cloud-py
+pip install arduino-iot-cloud
 ```
 
 You will also need to have configured a manual device in the cloud. The **Device ID** and **Secret Key** are required in your script to authenticate. To connect, we use the following command: