Prepare release notes for 1.33 Charmed Kubernetes Release (#894)

* Prepare release notes for 1.33 Charmed Kubernetes Release

* Applied review comments

Author: addyess

generator/k8s_docs_tools/templates/upgrading.j2

@@ -20,7 +20,7 @@ You can check the latest release version on the [Kubernetes release page on GitH
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     <span class="p-notification__title">Note:</span>
-    <p class="p-notification__message"><strong>Kubernetes</strong> will automatically handle patch releases. This means that the cluster will perform an unattended automatic upgrade between patch versions, e.g. 1.24.1 to 1.24.2. Attended upgrades are only required when you wish to upgrade a minor version, e.g. 1.22.x to 1.23.x.</p>
+    <p class="p-notification__message"><strong>Kubernetes</strong> will automatically handle patch releases. This means that the cluster will perform an unattended automatic upgrade between patch versions, e.g. 1.33.1 to 1.33.2. Attended upgrades are only required when you wish to upgrade a minor version, e.g. 1.32.x to 1.33.x.</p>
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@@ -39,7 +39,7 @@ The 'App' section of the output lists each application and its version number. N
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     <span class="p-notification__title">Warning!:</span>
-    <p class="p-notification__message"><strong>Juju compatibility</strong>  The latest current version of Juju (as of the time of the Charmed Kubernetes {{release}} release) is <strong>3.1</strong>. This new major release introduces some breaking changes with previous versions. It is recommended that you upgrade to this new version of Juju, but also be aware of the changes. See the <a href="https://documentation.ubuntu.com/juju/3.6/howto/manage-controllers/#upgrade-a-controller"> Juju documentation</a> for more information.</p>
+    <p class="p-notification__message"><strong>Juju compatibility</strong>  The latest current version of Juju (as of the time of the Charmed Kubernetes {{release}} release) is <strong>3.6</strong>. This new major release introduces some breaking changes with previous versions. It is recommended that you upgrade to this new version of Juju, but also be aware of the changes. See the <a href="https://documentation.ubuntu.com/juju/3.6/howto/manage-controllers/#upgrade-a-controller"> Juju documentation</a> for more information.</p>
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@@ -54,7 +54,7 @@ You should also make sure:
 -   Your Juju client and controller/models are running the same, stable version of Juju (see the [Juju docs][juju-controller-upgrade]).
 -   You read the [Upgrade notes][notes] to see if any caveats apply to the versions you are upgrading to/from.
 -   You read the [Release notes][release-notes] for the version you are upgrading to, which will alert you to any important changes to the operation of your cluster.
--   You read the [Upstream release notes](https://github.com/kubernetes/kubernetes/blob/master/CHANGELOG/CHANGELOG-1.27.md#deprecation) for details of deprecation notices and API changes for Kubernetes 1.27 which may impact your workloads.
+-   You read the [Upstream release notes](https://github.com/kubernetes/kubernetes/blob/master/CHANGELOG/CHANGELOG-{{ release }}.md#deprecation) for details of deprecation notices and API changes for Kubernetes {{ release }} which may impact your workloads.
 
 It is also important to understand that **Charmed Kubernetes** will only upgrade
 and if necessary migrate, components relating specifically to elements of
@@ -66,12 +66,12 @@ deprecated APIs.
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     <span class="p-notification__title">Note:</span>
-    <p class="p-notification__message"><strong>The 'bionic' series (Ubuntu 18.04) is no longer supported:</strong> Support for bionic series charms in relation to Charmed Kubernetes has expired. If you are running charms on 'bionic', you will need to series upgrade the charms before completing the rest of the upgrade procedure.</p>
+    <p class="p-notification__message"><strong>The 'Focal' series (Ubuntu 20.04) is no longer supported:</strong> Support for Focal series charms in relation to Charmed Kubernetes has expired. If you are running charms on 'Focal', you will need to series upgrade the charms before completing the rest of the upgrade procedure.</p>
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-## Upgrading the Machine's Series (required for machines currently running 18.04(Bionic))
+## Upgrading the Machine's Series (required for machines currently running 20.04 - Focal)
 
 All of the charms support [upgrading the machine's series via Juju](https://documentation.ubuntu.com/juju/3.6/reference/juju-cli/list-of-juju-cli-commands/upgrade-machine/).
 As each machine is upgraded, the applications on that machine will be stopped and the unit will