Fixed grammar and style

According to doc review and style guide, some wording, grammar and style
issues are fixed.

Author: chabowski

adoc/SAPDI3-Rancher.adoc

@@ -10,8 +10,8 @@ To install RKE2, the script provided at https://get.rke2.io can be used as follo
 $ curl -sfL https://get.rke2.io | INSTALL_RKE2_VERSION=v1.31.7+rke2r1 sh
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-For HA setups, it is necessary to create RKE2 cluster configuration files in advance.
-On the first master node:
+For HA setups, you must create RKE2 cluster configuration files in advance.
+On the first master node, do the following:
 [source, bash]
 ----
 $ mkdir -p /etc/rancher/rke2
@@ -43,9 +43,11 @@ tls-san:
 EOF
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-IMPORTANT: You also need take about ETCD Snapshots and to perfom backups of your Rancher instance. This is not part of this Document and you can find more information in our Documentation.
+IMPORTANT: You also need take about ETCD Snapshots and to perfom backups of your Rancher instance. 
+This is not part of this Document and you can find more information in our Documentation.
 
-IMPORTANT: For security reasons, we generally recommend activating the CIS profile when installing RKE2. This is currently still being validated and will be included in the documentation at a later date. 
+IMPORTANT: For security reasons, we generally recommend activating the CIS profile when installing RKE2. 
+This is currently still being validated and will be included in the documentation at a later date. 
 
 Now enable and start the RKE2 components and run the following command on each cluster node:
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@@ -59,7 +61,8 @@ To verify the installation, run the following command:
 $ /var/lib/rancher/rke2/bin/kubectl --kubeconfig /etc/rancher/rke2/rke2.yaml get nodes
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-For convenience, the `kubectl` binary can be added to the *$PATH* and the given `kubeconfig` can be set via an environment variable:
+For convenience, you can add the `kubectl` binary to the *$PATH* and set the specified `kubeconfig` 
+via an environment variable:
 
 [source, bash]
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