(Fstart_process): Fix docstring.

src/process.c

@@ -1457,12 +1457,12 @@ static Lisp_Object start_process_unwind ();
 DEFUN ("start-process", Fstart_process, Sstart_process, 3, MANY, 0,
        doc: /* Start a program in a subprocess.  Return the process object for it.
 NAME is name for process.  It is modified if necessary to make it unique.
-BUFFER is the buffer or (buffer-name) to associate with the process.
+BUFFER is the buffer (or buffer name) to associate with the process.
  Process output goes at end of that buffer, unless you specify
  an output stream or filter function to handle the output.
  BUFFER may be also nil, meaning that this process is not associated
  with any buffer.
-Third arg is program file name.  It is searched for in PATH.
+PROGRAM is the program file name.  It is searched for in PATH.
 Remaining arguments are strings to give program as arguments.
 
 usage: (start-process NAME BUFFER PROGRAM &rest PROGRAM-ARGS)  */)