Add release notes for v2.4.6
Add release notes for v2.4.6

Change-Id: I550a08e1131eb469697a0effab33c9c7fcff96b0

cgi-eoss/ftep,cgi-eoss/ftep,cgi-eoss/ftep,cgi-eoss/ftep,cgi-eoss/ftep,cgi-eoss/ftep,cgi-eoss/ftep