Include removal of scheduler/tracing in changelog (facebook#26063)

Author: eps1lon

CHANGELOG.md

@@ -102,6 +102,10 @@ The existing `renderToString` method keeps working but is discouraged.
 * **Layout Effects with Suspense**: When a tree re-suspends and reverts to a fallback, React will now clean up layout effects, and then re-create them when the content inside the boundary is shown again. This fixes an issue which prevented component libraries from correctly measuring layout when used with Suspense.
 * **New JS Environment Requirements**: React now depends on modern browsers features including `Promise`, `Symbol`, and `Object.assign`. If you support older browsers and devices such as Internet Explorer which do not provide modern browser features natively or have non-compliant implementations, consider including a global polyfill in your bundled application.
 
+### Scheduler (Experimental)
+
+* Remove unstable `scheduler/tracing` API
+
 ## Notable Changes
 
 ### React
@@ -193,6 +197,10 @@ The existing `renderToString` method keeps working but is discouraged.
 * Fix a mistake in the Node loader. ([#22537](https://github.com/facebook/react/pull/22537) by [@btea](https://github.com/btea))
 * Use `globalThis` instead of `window` for edge environments. ([#22777](https://github.com/facebook/react/pull/22777) by [@huozhi](https://github.com/huozhi))
 
+### Scheduler (Experimental)
+
+* Remove unstable `scheduler/tracing` API ([#20037](https://github.com/facebook/react/pull/20037) by [@bvaughn](https://github.com/bvaughn))
+
 ## 17.0.2 (March 22, 2021)
 
 ### React DOM