docs: update doc strings

cleanmedia.py

@@ -152,7 +152,7 @@ class MediaRepository:
 
         Args:
             media_path: Path to media storage directory
-            connection_string: PostgreSQL connection string
+            connection_strings: Dictionary of db connection strings
 
         Raises:
             ValueError: If media_path doesn't exist or connection string is invalid
@@ -191,6 +191,9 @@ class MediaRepository:
     def connect_db(self, connection_string: str) -> DBConnection:
         """Establish database connection.
 
+        Args:
+            connection_string: db connection string
+
         Returns:
             PostgreSQL connection object
 
@@ -317,7 +320,7 @@ def read_config(conf_file: Union[str, Path]) -> Tuple[Path, dict[str, str]]:
         conf_file: Path to Dendrite YAML config file
 
     Returns:
-        Tuple of (media_path, connection_string)
+        Tuple of (media_path, connection_strings)
 
     Raises:
         SystemExit: If config file is invalid or missing required fields