Update changelog

CHANGELOG.md

@@ -7,7 +7,7 @@
 - Fixed a bug where mouse events would bubble up when `sl-button` was disabled, causing tooltips to erroneously appear
 - Fixed a bug where pressing space would open and immediately close `sl-dropdown` panels in Firefox
 - Fixed a bug where `sl-tooltip` would throw an error on init
-- Fixed buggy custom keyframes animation example
+- Fixed a bug in custom keyframes animation example
 - Refactored clear logic in `sl-input`
 
 ## 2.0.0-beta.18