Update CHANGELOG-VAADIN8.md

CHANGELOG-VAADIN8.md

@@ -6,7 +6,7 @@
 See LICENSE file in the downloadable package for more information.
 * Fixed issue [#12562](https://github.com/vaadin/framework/issues/12562). The internal state of ComboBox got confused when adding new items after calling `clear()`.
 * Improved the `vaadin-server-mpr-jakarta` and `vaadin-compatibility-server-mpr-jakarta` POM dependency definitions such that these packages do not pull in `vaadin-server` and `vaadin-compatibility-server` as unwanted dependencies, respectively.
-* Fixed a number of assertion function which would fail when MPR was in use. Improves testability of the framework and should allow running with assertions enabled in MPR configurations.
+* Fixed a number of assertion functions which would fail when MPR was in use. Improves testability of the framework and should allow running with assertions enabled in MPR configurations.
 * Removed logging of Atmosphere version while MPR is in use. This fixes runtime failures under some configurations.
 * Updated Atmosphere to version 2.4.30-vaadin5 in order to make Vaadin Framework 8 compatible with Jetty 10.
 * Updated Vaadin License Checker to version 1.11.2 to support new license model.