markdown fixes - add empty lines around shell backticks

Signed-off-by: Dmitry S <dsavints@gmail.com>

content/en/verifying/verify.md

@@ -80,15 +80,20 @@ $ cosign verify --certificate cosign.crt --certificate-chain chain.crt --certifi
 ```
 
 ## Verify image with user-provided trusted chain
+
 Verify image with the provided certificate chain(s) and identity parameters (intended for
 "bring your own PKI" use cases).
+
 * with a single certificate chain file - which may contain one or several intermediate
 certificates followed by the root CA certificate - use the `--certificate-chain` parameter:
+
 ```shell
 $ cosign verify --certificate-chain chain.crt --certificate-oidc-issuer https://issuer.example.com --certificate-identity foo@example.com user/demo
 ```
+
 * with a certificate bundle PEM file containing several CA roots and (optionally)
 intermediate certificates, use the `--ca-roots` parameter together with `--ca-intermediates`:
+
 ```shell
 $ cosign verify --ca-roots ca-roots.pem --ca-intermediates ca-intermediates \
   --certificate-oidc-issuer https://issuer.example.com \