Put two attestation binding sentences on two lines

Author: JonJagger

cmd/kosli/root.go

@@ -51,7 +51,7 @@ images in registries or "docker" for local docker images.
 
 	attestationBindingDesc = `
 
-The attestation can be bound to a *trail* using the trail name.
+The attestation can be bound to a *trail* using the trail name.  
 The attestation can be bound to an *artifact* in two ways:
 - using the artifact's SHA256 fingerprint which is calculated (based on the ^--artifact-type^ flag and the artifact name/path argument) or can be provided directly (with the ^--fingerprint^ flag).
 - using the artifact's name in the flow yaml template and the git commit from which the artifact is/will be created. Useful when reporting an attestation before creating/reporting the artifact.`