Fix typo in docstring.

Author: ChrisCummins

compiler_gym/envs/compiler_env.py

@@ -221,7 +221,8 @@ def __init__(
             to use.
 
         :param service_pool: A service pool to use for acquiring a service
-            connection. If not specified, the global service pool is used.
+            connection. If not specified, the :meth:`global service pool
+            <compiler_gym.service.ServiceConnectionPool.get>` is used.
 
         :raises FileNotFoundError: If service is a path to a file that is not
             found.
@@ -561,7 +562,7 @@ def observation_space(
             self.observation_space_spec = None
 
     def _init_kwargs(self) -> Dict[str, Any]:
-        """Retturn a dictionary of keyword arguments used to construct the
+        """Return a dictionary of keyword arguments used to construct the
         environment.
         """
         return {