Set data description for all Rainbird config flow fields (#131432)

homeassistant/components/rainbird/quality_scale.yaml

@@ -1,8 +1,6 @@
 rules:
   # Bronze
-  config-flow:
-    status: todo
-    comment: Some fields are missing data descriptions.
+  config-flow: done
   brands: done
   dependency-transparency: done
   common-modules: done

homeassistant/components/rainbird/strings.json

@@ -9,7 +9,8 @@
           "password": "[%key:common::config_flow::data::password%]"
         },
         "data_description": {
-          "host": "The hostname or IP address of your Rain Bird device."
+          "host": "The hostname or IP address of your Rain Bird device.",
+          "password": "The password used to authenticate with the Rain Bird device."
         }
       }
     },