readme.eng: beautify

docs/readme.eng.md

@@ -424,7 +424,7 @@ ipv4 : Linux allows to send ipv4 fragments but standard firewall rules in OUTPUT
 
 ipv6 : There's no way for an application to reliably send fragments without defragmentation by conntrack.
 Sometimes it works, sometimes system defragments packets.
-Looks like kernels <4.16 have no simple way to solve this problem. Unloading of nf_conntrack module
+Looks like kernels <4.16 have no simple way to solve this problem. Unloading of `nf_conntrack` module
 and its dependency `nf_defrag_ipv6` helps but this severely impacts functionality.
 Kernels 4.16+ exclude from defragmentation untracked packets.
 See `blockcheck.sh` code for example.