Update account validity feature line in changelog

CHANGES.md

@@ -6,7 +6,7 @@ The Third-Party Event Rules module interface has been deprecated in favour of th
 Features
 --------
 
-- Add a module type for the account validity feature. ([\#9884](https://github.com/matrix-org/synapse/issues/9884))
+- Add the ability to override the account validity feature with a module. ([\#9884](https://github.com/matrix-org/synapse/issues/9884))
 - The spaces summary API now returns any joinable rooms, not only rooms which are world-readable. ([\#10298](https://github.com/matrix-org/synapse/issues/10298), [\#10305](https://github.com/matrix-org/synapse/issues/10305))
 - Add a new version of the R30 phone-home metric, which removes a false impression of retention given by the old R30 metric. ([\#10332](https://github.com/matrix-org/synapse/issues/10332), [\#10427](https://github.com/matrix-org/synapse/issues/10427))
 - Allow providing credentials to `http_proxy`. ([\#10360](https://github.com/matrix-org/synapse/issues/10360))