Fix the guide link

Signed-off-by: Frantisek Lachman <[email protected]>

content/docs/guide.md

@@ -393,7 +393,7 @@ to re-trigger every failed test.
 
 So you already have a `jobs` section in your config. Let's extend it with another
 jobs that will handle the Fedora updates: `propose_downstream`, `koji_build` and `bodhi_udpate`.
-These are explained in detail in our [release guide](fedora-releases-guide.md).
+These are explained in detail in our [release guide](/docs/fedora-releases-guide).
 
 And that's about it. Now you should be able to use the core features of the Packit.
 If you have any questions, feel free to [reach out to us](https://packit.dev/#contact).