Generates a shell of documentation for the methods of a generic function.
promptMethods(f, filename = NULL, methods)a character string naming the generic function whose methods are to be documented.
usually, a connection or a character string giving the
    name of the file to which the documentation shell should be written.
    The default corresponds to the coded topic name for these methods
    (currently, f followed by "-methods.Rd").  Can also be
    FALSE or NA (see below).
optional "'>listOfMethods" object giving the methods to be
    documented.  By default, the first methods object for this generic
    is used (for example, if the current global environment has some
    methods for f, these would be documented).
If this argument is supplied, it is likely to be
    findMethods(f, where), with where some package
    containing methods for f.
If filename is FALSE, the text generated;
  if filename is NA, a list-style representation of the
  documentation shell.
  Otherwise, the name of the file written to is returned invisibly.
If filename is FALSE, the text created is returned,
  presumably to be inserted some other documentation file, such as the
  documentation of the generic function itself (see
  prompt).
If filename is NA, a list-style representation of the
  documentation shell is created and returned.  Writing the shell to a
  file amounts to cat(unlist(x), file = filename, sep = "\n"),
  where x is the list-style representation.
Otherwise, the documentation shell is written to the file specified by
  filename.
Chambers, John M. (2008) Software for Data Analysis: Programming with R Springer. (For the R version.)
Chambers, John M. (1998) Programming with Data Springer (For the original S4 version.)
prompt and
  promptClass