Link microservices (cncf#1199)

Signed-off-by: Henok Biadglign Ademtew <[email protected]>

Signed-off-by: Henok Biadglign Ademtew <[email protected]>

content/en/firewall.md

@@ -14,7 +14,7 @@ Firewalls can be hardware, software, or a combination of the two.
 
 By default, a network will allow anyone to enter and depart as long as they follow the network's routing rules. 
 Because of this default behavior, securing a network is challenging. 
-For example, in a microservices-based banking app, the services communicate with one another 
+For example, in a [microservices](/microservices/)-based banking app, the services communicate with one another 
 by transmitting highly sensitive financial data through their network. 
 A malicious actor may infiltrate the network, intercept communication, and do damage if there was no firewall in place.