* src/callint.c (Finteractive): Any other format spec than %s will
bug out with "Format specifier doesn’t match argument type", so
say explicitly that only %s is supported (bug#31314).
arguments to the command, concatenate the individual strings,
separating them by newline characters.
-Prompts are passed to `format', and may use % escapes to print the
+Prompts are passed to `format', and may use %s escapes to print the
arguments that have already been read.
+
If the argument is not a string, it is evaluated to get a list of
arguments to pass to the command.
+
Just `(interactive)' means pass no arguments to the command when
calling interactively.