docs: get_connection docstring correction (#29)

Corrected docstrings for `get_connection`.  Args were incorrectly listed as an accepted argument.

Author: iyad-f

litestar_asyncpg/config.py

@@ -288,9 +288,6 @@ async def provide_connection(self, state: "State", scope: "Scope") -> "AsyncGene
     async def get_connection(self) -> "AsyncGenerator[AsyncpgConnection, None]":
         """Create a connection instance.
 
-        Args:
-            pool: The pool to grab a connection from
-
         Returns:
             A connection instance.
         """