add Platinum support callout to upcoming release notes (#21722)

(Thank you Platinum sponsors!)

docs/notes/2.24.x.md

@@ -2,12 +2,12 @@
 
 Pants 2 is a fast, scalable, user-friendly build system for codebases of all sizes. It's currently focused on Python, Go, Java, Scala, Kotlin, Shell, and Docker, with support for other languages and frameworks coming soon.
 
-Individuals and companies can now [sponsor Pants financially](https://www.pantsbuild.org/sponsorship).
-
 Pants is an open-source project that is not owned or controlled by any one company or organization, and does incur some expenses. These expenses are managed by Pants Build, a non-profit that was established for this purpose. This non-profit's only source of revenue is sponsorship by individuals and companies that use Pants.
 
 We offer [formal sponsorship tiers for companies](https://www.pantsbuild.org/sponsorship), as well as individual sponsorships via [GitHub](https://github.com/sponsors/pantsbuild).
 
+Thank you to [Klayvio](https://www.klaviyo.com/) and [Normal Computing](https://normalcomputing.ai/) for their Platinum tier support through throughout this release.
+
 ## What's New
 
 ### Highlights

docs/notes/2.25.x.md

@@ -2,10 +2,11 @@
 
 Pants is a fast, scalable, user-friendly build system for codebases of all sizes.
 
-Pants is an open-source project that is not owned or controlled by any one company or organization,
-and does incur some expenses. These expenses are managed by Pants Build, a non-profit that was
-established for this purpose. This non-profit's only source of revenue is
-[sponsorship](https://www.pantsbuild.org/sponsorship) by individuals and companies that use Pants.
+Pants is an open-source project that is not owned or controlled by any one company or organization, and does incur some expenses. These expenses are managed by Pants Build, a non-profit that was established for this purpose. This non-profit's only source of revenue is [sponsorship](https://www.pantsbuild.org/sponsorship) by individuals and companies that use Pants.
+
+We offer [formal sponsorship tiers for companies](https://www.pantsbuild.org/sponsorship), as well as individual sponsorships via [GitHub](https://github.com/sponsors/pantsbuild).
+
+Thank you to [Klayvio](https://www.klaviyo.com/) and [Normal Computing](https://normalcomputing.ai/) for their Platinum tier support through throughout this release.
 
 ## What's New