Fix compatability -> compatibility typo (#21191)

Author: GregBrimble

src/content/changelog/workers/2025-03-11-process-env-support.mdx

@@ -44,4 +44,4 @@ To opt-in to the new `process.env` behaviour now, add the [`nodejs_compat_popula
 </WranglerConfig>
 
 After April 1, 2025, populating `process.env` will become the default behavior when both `nodejs_compat` is enabled and
-your Worker's `compatability_date` is after "2025-04-01".
+your Worker's `compatibility_date` is after "2025-04-01".