DOC-5205 RS: Emphasize upgrade prerequisites (#1512)

Author: rrelledge

content/operate/rs/installing-upgrading/upgrading/_index.md

@@ -17,7 +17,7 @@ To upgrade Redis Software:
 
 1. Verify appropriate [network ports]({{< relref "/operate/rs/networking/port-configurations.md" >}}) are either open or used by Redis Software.
 
-1. Review the [prerequisites]({{<relref "/operate/rs/installing-upgrading/upgrading/upgrade-cluster#upgrade-prerequisites">}}).
+1. Complete all [prerequisites]({{<relref "/operate/rs/installing-upgrading/upgrading/upgrade-cluster#upgrade-prerequisites">}}) before starting the upgrade.
 
 1. Upgrade the software on all nodes of the cluster using one of the following methods:
 
@@ -33,7 +33,7 @@ To upgrade Redis Software:
 
 To upgrade the cluster's operating system:
 
-1. Review the [prerequisites]({{<relref "/operate/rs/installing-upgrading/upgrading/upgrade-os#prerequisites">}}).
+1. Complete all [prerequisites]({{<relref "/operate/rs/installing-upgrading/upgrading/upgrade-os#prerequisites">}})  before starting the upgrade.
 
 2. Use one of the following rolling upgrade methods:
 

content/operate/rs/installing-upgrading/upgrading/upgrade-cluster.md

@@ -52,6 +52,8 @@ Before upgrading a cluster:
 
 Starting with the primary node, follow these steps for every node in the cluster. To ensure cluster availability, upgrade each node separately.
 
+1. Complete all [prerequisites](#upgrade-prerequisites) before starting the upgrade.
+
 1.  Verify node operation with the following commands:
 
     ``` shell
@@ -106,6 +108,8 @@ To perform a rolling upgrade of the cluster, use one of the following methods:
 
 ### Extra node upgrade method {#extra-node-upgrade}
 
+1. Complete all [prerequisites](#upgrade-prerequisites) before starting the rolling upgrade.
+
 1. [Install a later version of Redis Software]({{< relref "/operate/rs/installing-upgrading/install/install-on-linux" >}}) on a new node.
 
 1. [Add the new node]({{< relref "/operate/rs/clusters/add-node" >}}) to the cluster.
@@ -118,6 +122,8 @@ To perform a rolling upgrade of the cluster, use one of the following methods:
 
 ### Replace node upgrade method {#replace-node-upgrade}
 
+1. Complete all [prerequisites](#upgrade-prerequisites) before starting the rolling upgrade.
+
 1. [Remove a node]({{< relref "/operate/rs/clusters/remove-node#remove-a-node" >}}) with the earlier Redis Software version from the cluster.
 
 1. Uninstall Redis Enterprise Software from the removed node:

content/operate/rs/installing-upgrading/upgrading/upgrade-database.md

@@ -79,6 +79,8 @@ Before upgrading a database:
 
 To upgrade a database:
 
+1. Complete all [prerequisites](#upgrade-prerequisites) before starting the upgrade.
+
 1.  _(Optional)_  Back up the database to minimize the risk of data loss.
 
 1.  Use [`rladmin`]({{< relref "/operate/rs/references/cli-utilities/rladmin/upgrade" >}}) to upgrade the database. During the upgrade process, the database will restart without losing any data.

content/operate/rs/installing-upgrading/upgrading/upgrade-os.md

@@ -72,6 +72,8 @@ To upgrade the cluster's operating system, use one of the following rolling upgr
 
 ### Extra node upgrade method {#extra-node-upgrade}
 
+1. Complete all [prerequisites](#prerequisites) before starting the rolling upgrade.
+
 1. Create a node with the OS upgrade version.
 
 1. [Install the cluster's current Redis Enterprise Software version]({{< relref "/operate/rs/installing-upgrading/install/install-on-linux" >}}) on the new node using the installation package for the OS upgrade version.
@@ -84,6 +86,8 @@ To upgrade the cluster's operating system, use one of the following rolling upgr
 
 ### Replace node upgrade method {#replace-node-upgrade}
 
+1. Complete all [prerequisites](#prerequisites) before starting the rolling upgrade.
+
 1. [Remove a node]({{< relref "/operate/rs/clusters/remove-node#remove-a-node" >}}) with the earlier OS version from the cluster.
 
 1. Uninstall Redis Enterprise Software from the removed node: