Fix description in the module openy_node_alert

[ddrozdik]

There is a module openy_node_alert. This module has an empty description in configuration files(6 files).

We need to add a description.

See for details
https://github.com/ymcatwincities/openy/blob/8.x-1.x/modules/openy_features/openy_node/modules/openy_node_alert/config/install/field.field.node.alert.field_alert_color.yml#L13

and documentation
https://github.com/ymcatwincities/openy/blob/8.x-1.x/docs/Content%20structure/Content%20Types/Alert.md

Steps to find the content type:

1. Open openY
2. Login as admin
3. Go to Administration -> Structure -> Content types -> Alert