Move url out of rachio strings.json (home-assistant#154781)

Author: andrew-codechimp

homeassistant/components/rachio/config_flow.py

@@ -91,7 +91,12 @@ async def async_step_user(
                 errors["base"] = "unknown"
 
         return self.async_show_form(
-            step_id="user", data_schema=DATA_SCHEMA, errors=errors
+            step_id="user",
+            data_schema=DATA_SCHEMA,
+            errors=errors,
+            description_placeholders={
+                "api_key_url": "https://app.rach.io/",
+            },
         )
 
     async def async_step_homekit(

homeassistant/components/rachio/strings.json

@@ -3,7 +3,7 @@
     "step": {
       "user": {
         "title": "Connect to your Rachio device",
-        "description": "You will need the API key from https://app.rach.io/. Go to Settings, then select 'GET API KEY'.",
+        "description": "You will need the API key from {api_key_url}. Go to Settings, then select 'GET API KEY'.",
         "data": {
           "api_key": "[%key:common::config_flow::data::api_key%]"
         }