Documentation: add ENV variable ETCD_CIPHER_SUITES description
Fixes
@@ -310,6 +310,11 @@ The security flags help to [build a secure etcd cluster][security].
+ default: none
+ env variable: ETCD_PEER_CERT_ALLOWED_CN
+### --cipher-suites
++ Comma-separated list of supported TLS cipher suites between server/client and peers.
++ default: ""
++ env variable: ETCD_CIPHER_SUITES
+
## Logging flags
### --logger
