Add missing config flow abort strings (#86180)

* Add missing `already_configured` and `already_in_progress` abort strings

* Note required strings.json entries in config_entries aborting functions

homeassistant/config_entries.py

@@ -1455,7 +1455,10 @@ class ConfigFlow(data_entry_flow.FlowHandler):
     def _async_abort_entries_match(
         self, match_dict: dict[str, Any] | None = None
     ) -> None:
-        """Abort if current entries match all data."""
+        """Abort if current entries match all data.
+
+        Requires `already_configured` in strings.json in user visible flows.
+        """
         if match_dict is None:
             match_dict = {}  # Match any entry
         for entry in self._async_current_entries(include_ignore=False):
@@ -1477,7 +1480,11 @@ class ConfigFlow(data_entry_flow.FlowHandler):
         *,
         error: str = "already_configured",
     ) -> None:
-        """Abort if the unique ID is already configured."""
+        """Abort if the unique ID is already configured.
+
+        Requires strings.json entry corresponding to the `error` parameter
+        in user visible flows.
+        """
         if self.unique_id is None:
             return
 
@@ -1619,6 +1626,9 @@ class ConfigFlow(data_entry_flow.FlowHandler):
         when the handler has no existing config entries.
 
         It ensures that the discovery can be ignored by the user.
+
+        Requires `already_configured` and `already_in_progress` in strings.json
+        in user visible flows.
         """
         if self.unique_id is not None:
             return