fix comments in server/db/initalizer.rs

src/libtrader/server/db/initializer.rs

@@ -1,13 +1,14 @@
 /// Establishes a postgresql connection to the SQL database.
 ///
 /// Creates a postgresql connection.
+/// Should be used in Async contexts.
 ///
 /// Arguments:
 /// user - The name of the user to connect to the database with.
 /// pass - The password of the user to connect to the database with.
 ///
-/// Returns: ```postgres::Client``` on success, and a string containing the
-/// reason of failure on error.
+/// Returns: ```Result``` wrapping  ```tokio_postgres::Client``` on success, 
+/// and ```tokio_postgres::Error``` on error.
 ///
 /// Example:
 /// ```rust