Clarify what happens to the setf expander when a function changes.
Clarify what happens to the setf expander when a function changes.

vtomole/SICL,vtomole/SICL,vtomole/SICL,clasp-developers/SICL,vtomole/SICL,clasp-developers/SICL,clasp-developers/SICL,clasp-developers/SICL