CLEANUP: assorted typo fixes in the code and comments

This is 10th iteration of typo fixes
diff --git a/examples/transparent_proxy.cfg b/examples/transparent_proxy.cfg
index b514ae3..a8cf6d9 100644
--- a/examples/transparent_proxy.cfg
+++ b/examples/transparent_proxy.cfg
@@ -31,7 +31,7 @@
 # The following would be even better but this did not seam to work on the pfSense2.1 distribution of FreeBSD 8.3:
 #   fwd 127.0.0.1:80 tcp from any 80 to any in recv ${outside_iface} uid ${proxy_uid}
 #
-# If only 'pf' is currently used some aditional steps are needed to load and configure ipfw:
+# If only 'pf' is currently used some additional steps are needed to load and configure ipfw:
 # You need to configure this to always run on startup:
 #
 # /sbin/kldload ipfw
@@ -40,13 +40,13 @@
 # ipfw add 10 fwd localhost tcp from 192.168.0.40 80 to any in recv em0
 #
 # the above does the following:
-# - load the ipfw kernal module
+# - load the ipfw kernel module
 # - set pf as the outer firewall to keep control of routing packets for example to route them to a non-default gateway
 # - enable ipfw
 # - set a rule to catches reply traffic on em0 coming from the webserver
 #
 # --- Step 2 ---
-# To also make the client connection transparent its possible to redirect incomming requests to HAProxy with a pf rule:
+# To also make the client connection transparent its possible to redirect incoming requests to HAProxy with a pf rule:
 #   rdr on em1 proto tcp from any to 192.168.0.40 port 80 -> 192.168.1.22
 # here em1 is the interface that faces the clients, and traffic that is originally send straight to the webserver is redirected to HAProxy
 #