Added link to document "Reset root password"

doc/security/README.md

@@ -4,4 +4,4 @@
 - [Rack attack](rack_attack.md)
 - [Web Hooks and insecure internal web services](webhooks.md)
 - [Information exclusivity](information_exclusivity.md)
-- [Reset your root password] (reset_root_password.md)
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+- [Reset your root password] (https://dev.gitlab.org/gitlab/gitlabhq/blob/How_to_Reset_your_root_password/doc/security/reset_root_password.md)
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