Fix spelling errors
diff --git a/clients/eventdemo.c b/clients/eventdemo.c
index 569a8c1..e59b076 100644
--- a/clients/eventdemo.c
+++ b/clients/eventdemo.c
@@ -210,7 +210,7 @@
* \brief CALLBACK function, Wayland informs about button event
* \param widget widget
* \param input input device that caused the button event
- * \param time time the event happend
+ * \param time time the event happened
* \param button button
* \param state pressed or released
* \param data user data associated to the window
@@ -259,7 +259,7 @@
* \brief CALLBACK function, Waylands informs about pointer motion
* \param widget widget
* \param input input device that caused the motion event
- * \param time time the event happend
+ * \param time time the event happened
* \param x absolute x position
* \param y absolute y position
* \param sx x position relative to the window