Fix incorrect `relationship_severance_event` attribute name in changelog (#33443)

CHANGELOG.md

@@ -135,7 +135,7 @@ The following changelog entries focus on changes visible to users, administrator
 - **Add notifications of severed relationships** (#27511, #29665, #29668, #29670, #29700, #29714, #29712, and #29731 by @ClearlyClaire and @Gargron)\
   Notify local users when they lose relationships as a result of a local moderator blocking a remote account or server, allowing the affected user to retrieve the list of broken relationships.\
   Note that this does not notify remote users.\
-  This adds the `severed_relationships` notification type to the REST API and streaming, with a new [`relationship_severance_event` attribute](https://docs.joinmastodon.org/entities/Notification/#relationship_severance_event).
+  This adds the `severed_relationships` notification type to the REST API and streaming, with a new [`event` attribute](https://docs.joinmastodon.org/entities/Notification/#relationship_severance_event).
 - **Add hover cards in web UI** (#30754, #30864, #30850, #30879, #30928, #30949, #30948, #30931, and #31300 by @ClearlyClaire, @Gargron, and @renchap)\
   Hovering over an avatar or username will now display a hover card with the first two lines of the user's description and their first two profile fields.\
   This can be disabled in the “Animations and accessibility” section of the preferences.