NIFI-8686 Update administration guide with kernel 3 time_wait setting

Signed-off-by: Matthew Burgess <mattyb149@apache.org>

This closes #5149
diff --git a/nifi-docs/src/main/asciidoc/administration-guide.adoc b/nifi-docs/src/main/asciidoc/administration-guide.adoc
index 98146ab..a231d46 100644
--- a/nifi-docs/src/main/asciidoc/administration-guide.adoc
+++ b/nifi-docs/src/main/asciidoc/administration-guide.adoc
@@ -139,9 +139,15 @@
 You don't want your sockets to sit and linger too long given that you want to be
 able to quickly setup and teardown new sockets.  It is a good idea to read more about
 it and adjust to something like
+
+for kernel 2.6
 ----
 sudo sysctl -w net.ipv4.netfilter.ip_conntrack_tcp_timeout_time_wait="1"
 ----
+for kernel 3.0
+----
+sudo sysctl -w net.netfilter.nf_conntrack_tcp_timeout_time_wait="1"
+----
 
 Tell Linux you never want NiFi to swap::
 Swapping is fantastic for some applications.  It isn't good for something like