commented some io library functions

module/io.lua

@@ -1,12 +1,12 @@
 io = {}
 
-function io.open(path,mode)
+function io.open(path,mode) -- Open file *path* in *mode*. Returns a buffer object.
  local f,e = fs.open(path, mode)
  if not f then return false, e end
  return buffer.new(mode,f)
 end
 
-function io.input(fd)
+function io.input(fd) -- Sets the default input stream to *fd* if provided, either as a buffer as a path. Returns the default input stream.
  if type(fd) == "string" then
   fd=io.open(fd,"rb")
  end
@@ -15,7 +15,7 @@ function io.input(fd)
  end
  return os.getenv("STDIN")
 end
-function io.output(fd)
+function io.output(fd) -- Sets the default output stream to *fd* if provided, either as a buffer as a path. Returns the default output stream.
  if type(fd) == "string" then
   fd=io.open(fd,"wb")
  end
@@ -25,14 +25,14 @@ function io.output(fd)
  return os.getenv("STDOUT")
 end
 
-function io.read(...)
- return io.input():read()
+function io.read(...) -- Reads from the default input stream.
+ return io.input():read(...)
 end
-function io.write(...)
+function io.write(...) -- Writes its arguments to the default output stream.
  io.output():write(...)
 end
 
-function print(...)
+function print(...) -- Writes each argument to the default output stream, separated by newlines.
  for k,v in ipairs({...}) do
   io.write(tostring(v).."\n")
  end