port-filename documentation incorrect

[Andy Wingo]

Quoth the docs:

 -- Scheme Procedure: port-filename port
 -- C Function: scm_port_filename (port)
     Return the filename associated with PORT.  This function returns
     the strings "standard input", "standard output" and "standard
     error" when called on the current input, output and error ports
     respectively.

     PORT must be open, `port-filename' cannot be used once the port is
     closed.

But:

  scheme@(guile-user)> (port-filename (current-input-port))
  $1 = #f

And additionally, when connecting to a --listen socket:

  > (port-filename (current-input-port))
  $3 = socket

i.e. a symbol, not a string (!).

Andy
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