zephyr-insert-hook-list documentation

zephyr-insert-hook-list's default value is
   '(zephyr-ping-notify
     zephyr-insert-message
     zephyr-make-message-extents
     zephyr-touch
     zephyr-notify-with-message
     zephyr-notify-with-beep
     zephyr-notify-with-scroll
     zephyr-notify-with-deiconify)

Documentation:
A list of functions to call to insert a message in a buffer.  These
functions are called by zephyr-insert if the message passes the
zephyr-filters for a given zephyr buffer.  Each function must return a
(possibly modified) message for the following functions to use.  The
list of functions will be called for each buffer in which the message
is to be inserted.