Apply suggestion to doc/security/rack_attack.md

doc/security/rack_attack.md

@@ -3,7 +3,7 @@ type: reference, howto
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 # Rack Attack
 
-Rack Attack, also known as Rack::Attack, is [a rubygem](https://github.com/kickstarter/rack-attack)
+[Rack Attack](https://github.com/kickstarter/rack-attack), also known as Rack::Attack, is a Ruby gem
 that is meant to protect GitLab with the ability to customize throttling and
 to block user IP addresses.