doc(certificates): add missing email for rfc2136
diff --git a/docs/certificates.md b/docs/certificates.md
index 7975116..1963259 100644
--- a/docs/certificates.md
+++ b/docs/certificates.md
@@ -21,8 +21,8 @@
 
 ```yaml
 atmosphere_issuer_config:
-  server: https://acme.example.com
   email: foo@bar.com
+  server: https://acme.example.com
 ```
 
 ### DNS-01 challenges
@@ -40,6 +40,7 @@
 
 ```yaml
 atmosphere_issuer_config:
+  email: foo@bar.com
   solver:
     type: rfc2136
     nameserver: <NAMESERVER>:<PORT>