Merge pull request #21954 from ahardin-rh/etcd-disk-edits

Style edits to etcd disk guidance

Author: ahardin-rh

modules/recommended-configurable-storage-technology.adoc

@@ -140,8 +140,8 @@ with the storage layer.
 == Other specific application storage recommendations
 
 * {product-title} Internal `etcd`: For the best `etcd` reliability, the lowest consistent latency storage technology is preferable.
-* It is highly recommended that you use `etcd` with storage that handles small
-read/write operations quickly, such as SSD. Ceph, NFS, and spinning disks are
+* It is highly recommended that you use `etcd` with storage that handles serial
+writes (fsync) quickly, such as NVMe or SSD. Ceph, NFS, and spinning disks are
 not recommended.
 * OpenStack Cinder: OpenStack Cinder tends to be adept in ROX access mode use cases.
 * Databases: Databases (RDBMSs, NoSQL DBs, etc.) tend to perform best with dedicated block storage.