Removed info on PPP (#20207)

Removed info on PPP from two pages and clarified on another that PPP is by request only

Author: peachdawnleach

src/current/_includes/common/upgrade/overview.md

@@ -15,10 +15,6 @@
     For CockroachDB {{ site.data.products.advanced }}, {{ site.data.products.standard }}, and {{ site.data.products.basic }} clusters, all production patch releases for a major version are automatically applied, until the cluster is upgraded to a new major version.
 {% endif %}
 
-    - In the lead-up to a new major version's GA, a series of beta and RC releases {% if page.path contains "cockroachcloud" %}may be made available to CockroachDB {{ site.data.products.advanced }} as Pre-Production Preview releases{% else %}are made available{% endif %} for testing and validation. Testing releases are intended for testing and experimentation only, and are not qualified for production environments or eligible for support or uptime SLA commitments.
-
-      {% if page.path contains "cockroachcloud" %}If a cluster is upgraded to a Pre-Production Preview release, it will be automatically upgraded to subsequent patch releases within the major version, including newer Pre-Production Preview testing releases, the GA release, and subsequent production patch releases.{% else %}{{site.data.alerts.callout_info}}A cluster cannot be upgraded from an alpha binary of a prior release or from a binary built from the `master` branch of the CockroachDB source code.{{site.data.alerts.end}}{% endif %}
-
 To learn more about CockroachDB major versions and patches, refer to the [Releases Overview]({% link releases/index.md %}#overview).
 
 {% if page.path contains "cockroachcloud" %}

src/current/cockroachcloud/create-an-advanced-cluster.md

@@ -126,14 +126,6 @@ The cluster is automatically given a randomly-generated name. If desired, change
 
 When you create a new cluster, it uses the [latest CockroachDB {{ site.data.products.cloud }} production release](https://www.cockroachlabs.com/docs/releases/cloud) by default. All clusters are then upgraded automatically to each subsequent patch release of their major version as it becomes available. To learn more, refer to [Upgrade Policy]({% link cockroachcloud/upgrade-policy.md %}).
 
-Prior to the GA release of a new CockroachDB major version, a series of Beta and Release Candidate (RC) releases are made available for CockroachDB {{ site.data.products.advanced }} as [Pre-Production Preview]({% link cockroachcloud/upgrade-policy.md %}#pre-production-preview-upgrades) releases. If available, the latest Pre-Production Preview release is listed as an option alongside the latest production release.
-
-{{site.data.alerts.callout_danger}}
-Testing releases, including Pre-Production Preview releases, are provided for testing and experimentation only, and are not qualified for production environments and not eligible for support or uptime SLA commitments.
-{{site.data.alerts.end}}
-
-If you install a Pre-Production Preview release, it will be upgraded to each subsequent beta or RC release automatically, before being upgraded to the GA and subsequent patch releases as they become available.
-
 To select the cluster version:
 
 1. Under **Cluster version**, click the version selector.

src/current/cockroachcloud/upgrade-policy.md

@@ -109,7 +109,9 @@ To summarize the available major-version upgrade paths for CockroachDB {{ site.d
 
 ### Pre-production preview upgrades
 
-Prior to the GA release of a major CockroachDB version, CockroachDB {{ site.data.products.cloud }} organizations can create new CockroachDB {{ site.data.products.advanced }} clusters on a Pre-Production Preview release or upgrade an existing cluster to a Pre-Production Preview. Pre-Production Preview releases are beta or release candidate (RC) builds that next major version of CockroachDB, and are provided for testing and experimentation. Upgrading to a Pre-Production Preview is a major-version upgrade. After a cluster is upgraded to a Pre-Production Preview release, it is automatically upgraded to all subsequent releases within the same major version—including additional beta and RC releases, the GA release, and subsequent production patch releases as [patch version upgrades](#patch-version-upgrades). Upgrading to a Pre-Production Preview follows the same procedure as updating to a Production release. To learn more, refer to [Upgrade a cluster in CockroachDB Cloud]({% link cockroachcloud/upgrade-cockroach-version.md %}).
+Prior to the GA release of a major CockroachDB version, CockroachDB {{ site.data.products.cloud }} organizations can request access to create new CockroachDB {{ site.data.products.advanced }} clusters on a Pre-Production Preview release or upgrade an existing cluster to a Pre-Production Preview. Pre-Production Preview releases are beta or release candidate (RC) builds of the next major version of CockroachDB, and are provided by request only for testing and experimentation. 
+
+Upgrading to a Pre-Production Preview is a major-version upgrade. After a cluster is upgraded to a Pre-Production Preview release, it is automatically upgraded to all subsequent releases within the same major version—including additional beta and RC releases, the GA release, and subsequent production patch releases as [patch version upgrades](#patch-version-upgrades). Upgrading to a Pre-Production Preview follows the same procedure as updating to a Production release. To learn more about the upgrade procedure, refer to [Upgrade a cluster in CockroachDB Cloud]({% link cockroachcloud/upgrade-cockroach-version.md %}).
 
 ### Rollback support