update administrator's guide

Author: stoty

zookeeper-docs/src/main/resources/markdown/zookeeperAdmin.md

@@ -1738,7 +1738,9 @@ and [SASL authentication for ZooKeeper](https://cwiki.apache.org/confluence/disp
     (Java system properties: **zookeeper.ssl.ciphersuites** and **zookeeper.ssl.quorum.ciphersuites**)
     **New in 3.5.5:**
     Specifies the enabled cipher suites to be used in client and quorum TLS negotiation.
-    Default: Enabled cipher suites depend on the Java runtime version being used.
+    Default: None, the JVM defaults are used (3.10.0+),
+    Enabled cipher suites are hard coded, with the ordering dependent on whether Java 8, or Java 9+ is used.
+    For Java 8 the list begins with the TLSv1.2 CBC ciphers, while for Java 9+ it begins with the TLSv1.2 CBM ciphers (3.5.5-3.9.x).
 
 * *ssl.context.supplier.class* and *ssl.quorum.context.supplier.class* :
     (Java system properties: **zookeeper.ssl.context.supplier.class** and **zookeeper.ssl.quorum.context.supplier.class**)