Last round of adapting style of documenting argument default values.
diff --git a/Doc/library/tty.rst b/Doc/library/tty.rst
index 688faee..d13c6f9 100644
--- a/Doc/library/tty.rst
+++ b/Doc/library/tty.rst
@@ -1,4 +1,3 @@
-
:mod:`tty` --- Terminal control functions
=========================================
@@ -17,14 +16,14 @@
The :mod:`tty` module defines the following functions:
-.. function:: setraw(fd[, when])
+.. function:: setraw(fd, when=termios.TCSAFLUSH)
Change the mode of the file descriptor *fd* to raw. If *when* is omitted, it
defaults to :const:`termios.TCSAFLUSH`, and is passed to
:func:`termios.tcsetattr`.
-.. function:: setcbreak(fd[, when])
+.. function:: setcbreak(fd, when=termios.TCSAFLUSH)
Change the mode of file descriptor *fd* to cbreak. If *when* is omitted, it
defaults to :const:`termios.TCSAFLUSH`, and is passed to