Explain asyncio introspection retries inline

Author: johnslavik

Doc/library/asyncio-tools.rst

@@ -147,7 +147,7 @@ Command-line options
 
 .. option:: --retries N
 
-   Retry failed attempts to inspect the target process up to *N* times.  See
-   :ref:`sampling-efficiency` for details about failed process memory reads.
+   Retry failed attempts to inspect the target process up to *N* times.  This
+   can help when the target process changes while its state is being read.
 
    .. versionadded:: 3.15