Comprehensive spelling/typo fixes.

Thanks to Josh Soref for generating these fixes.
diff --git a/contrib/reverse-dns/README b/contrib/reverse-dns/README
index 2ec4df1..9fd4efb 100644
--- a/contrib/reverse-dns/README
+++ b/contrib/reverse-dns/README
@@ -1,6 +1,6 @@
 The script reads stdin and replaces all IP addresses with names before

 outputting it again. IPs from private networks are reverse looked  up

-via dns. Other IP adresses are searched for in the dnsmasq query log.

+via dns. Other IP addresses are searched for in the dnsmasq query log.

 This gives names (CNAMEs if I understand DNS correctly) that are closer

 to the name the client originally asked for then the names obtained by

 reverse lookup. Just run