Update roomba config flow description (#77974)

* Update strings.json

Automatic retrieval of the Roomba password is not possible when the iRobot App is opened on any device.
If the iRobot App is open, the password retrieval will fail.
- I added a sentence informing the users that they should make sure that the iRobot App is closed on all devices, before pressing the Home Button on the Roomba.
- Also i added a sentence informing the users that they should make sure that the iRobot App is closed on all devices, in the failure message.
This way, more users will have a succesful password retrieval, resulting in a smoother configuration experience for their Roomba into Home Assistant.

* Update strings.json

Added the sentence to the front of the message
Added an "Important" notice to catch more attention.

* Update homeassistant/components/roomba/strings.json

Co-authored-by: Yevhenii Vaskivskyi <yevhenii.vaskivskyi@gmail.com>

* Update strings.json

Co-authored-by: Erik Montnemery <erik@montnemery.com>
Co-authored-by: Yevhenii Vaskivskyi <yevhenii.vaskivskyi@gmail.com>

homeassistant/components/roomba/strings.json

@@ -18,11 +18,11 @@
       },
       "link": {
         "title": "Retrieve Password",
-        "description": "Press and hold the Home button on {name} until the device generates a sound (about two seconds), then submit within 30 seconds."
+        "description": "Make sure that the iRobot app is not running on any device. Press and hold the Home button on {name} until the device generates a sound (about two seconds), then submit within 30 seconds."
       },
       "link_manual": {
         "title": "Enter Password",
-        "description": "The password could not be retrieved from the device automatically. Please follow the steps outlined in the documentation at: {auth_help_url}",
+        "description": "The password could not be retrieved from the device automatically. Please make sure that the iRobot app is not open on any device while trying to retrieve the password. Please follow the steps outlined in the documentation at: {auth_help_url}",
         "data": {
           "password": "[%key:common::config_flow::data::password%]"
         }