Update notes for submitted changes

* tcp: add a sysctl to config the tcp_default_init_rwnd
* fix false disconnect due to a signal sent to the reading process
* SELinux: Fix kernel BUG on empty security contexts.
* netfilter: xt_IDLETIMER: Revert to retain the kernel API format.
* SELinux: Fix possible NULL pointer dereference in selinux_inode_permission()
* ping: prevent NULL pointer dereference on write to msg_name
* nf: xt_qtaguid: fix handling for cases where tunnels are used.
* netfilter: qtaguid: rate limit some of the printks
* SELinux: include definition of new capabilities