Update doc/data/messages/r/raise-missing-from/details.rst

Author: Pierre-Sassoulas

doc/data/messages/r/raise-missing-from/details.rst

@@ -1,4 +1,5 @@
-You are raising the %s exception after the %s exception was caught.
+You are raising a new exception after an old exception was caught.
+
 It's likely that the second exception is a friendly re-wrapping of the first exception,
-therefore you should use ``raise new_exception from old_exception`` to see an accurate message
+therefore you should use ``raise NewException(...) from old_exception`` to see an accurate message
 between the two tracebacks.