Add a warning about Pexec(PE_LOAD)

gemdos/prozess/pexec.ui

@@ -43,7 +43,10 @@ for loading programs in a debugger. Corresponds to (!I)mode 0(!i) with the
 difference that the program is not launched immediately, but that a pointer
 to the child processes' basepage is returned as a LONG. The parent owns the
 memory of the child's environment and basepage and hence must free them when
-finished with the child.
+finished with the child. (!B)Note:(!b) flushing of the data cache and invalidation
+of the instruction cache is caller's responsibility in case the intention is not to
+use Pexec mode 4 but calling the the program's function manually instead (e.g. plugins
+with a jump table).
 
 !item [4]
 int32_t Pexec (4, 0L, PD *basepage, 0L);