Fix stable middleware changeset typo (#14255)

Author: wobsoriano

.changeset/shy-lemons-boil.md

@@ -9,7 +9,7 @@
 
 Stabilize middleware and context APIs.
 
-We have removed the `unstable_` prefix from the following APIs and they are not considered stable and ready for production use:
+We have removed the `unstable_` prefix from the following APIs and they are now considered stable and ready for production use:
 
 - [`RouterContextProvider`](https://reactrouter.com/api/utils/RouterContextProvider)
 - [`createContext`](https://reactrouter.com/api/utils/createContext)

contributors.yml

@@ -426,6 +426,7 @@
 - willsmithte
 - Willvillegas
 - wkovacs64
+- wobsoriano
 - woodywoodsta
 - xavier-lc
 - xcsnowcity