Bump patch level and document them.

Approved by:	so

UPDATING

@@ -16,6 +16,10 @@ from older versions of FreeBSD, try WITHOUT_CLANG and WITH_GCC to bootstrap to
 the tip of head, and then rebuild without this option. The bootstrap process
 from older version of current across the gcc/clang cutover is a bit fragile.
 
+20180806	p1	FreeBSD-SA-18:08.tcp
+
+	Fix resource exhaustion in TCP reassembly.
+
 20180627:
 	11.2-RELEASE.
 

sys/conf/newvers.sh

@@ -44,7 +44,7 @@
 
 TYPE="FreeBSD"
 REVISION="11.2"
-BRANCH="RELEASE"
+BRANCH="RELEASE-p1"
 if [ -n "${BRANCH_OVERRIDE}" ]; then
 	BRANCH=${BRANCH_OVERRIDE}
 fi