Removed line about NRU (#3531)

Author: julia-cb

modules/learn/pages/buckets-memory-and-storage/buckets.adoc

@@ -53,8 +53,6 @@ For a Memcached bucket, this means that data, which is resident in memory (but,
 Therefore, if removed data is subsequently needed, it cannot be re-acquired from Couchbase Server.
 Ejection removes all of an item's data.
 
-For all bucket-types, items are selected for ejection by means of the _Not Recently Used_ (NRU) algorithm.
-
 All bucket types are fully compatible with the Memcached open source distributed key-value cache.
 
 == Bucket Capabilities