Improve existing docstrings

Author: dandavison

temporalio/worker/_worker.py

@@ -195,12 +195,12 @@ def __init__(
                 identity is used.
             max_cached_workflows: If nonzero, workflows will be cached and
                 sticky task queues will be used.
-            max_concurrent_workflow_tasks: Maximum allowed number of workflow
-                tasks that will ever be given to this worker at one time. Mutually exclusive with ``tuner``.
+            max_concurrent_workflow_tasks: Maximum allowed number of
+                tasks that will ever be given to the workflow worker at one time. Mutually exclusive with ``tuner``.
             max_concurrent_activities: Maximum number of activity tasks that
-                will ever be given to this worker concurrently. Mutually exclusive with ``tuner``.
+                will ever be given to the activity worker concurrently. Mutually exclusive with ``tuner``.
             max_concurrent_local_activities: Maximum number of local activity
-                tasks that will ever be given to this worker concurrently. Mutually exclusive with ``tuner``.
+                tasks that will ever be given to the activity worker concurrently. Mutually exclusive with ``tuner``.
             tuner:  Provide a custom :py:class:`WorkerTuner`. Mutually exclusive with the
                 ``max_concurrent_workflow_tasks``, ``max_concurrent_activities``, and
                 ``max_concurrent_local_activities`` arguments.