Updating the docs to reflect the comments from the previous PR

Link to the discussion https://github.com/apache/zookeeper/pull/1034/files#r322682677

Author: Vladimir Ivic <vivic@fb.com>

Reviewers: Andor Molnar <anmolnar@apache.org>, Enrico Olivelli <eolivelli@apache.org>, maoling <maoling@apache.org>

Closes #1089 from vladimirivic/ZOOKEEPER-3491_docs_update

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

@@ -650,8 +650,7 @@ property, when available, is noted below.
     (Java system property: **zookeeper.commitLogCount**)
     Zookeeper maintains an in-memory list of last committed requests for fast synchronization with
     followers when the followers are not too behind. This improves sync performance in case when your
-    snapshots are large (>100,000).
-    The default commitLogCount value is 500.
+    snapshots are large (>100,000). The default value is 500 which is the recommended minimum.
 
 * *snapSizeLimitInKb* :
     (Java system property: **zookeeper.snapSizeLimitInKb**)