[FIX] sap.m.ComboBox: Change event documentation improved
[FIX] sap.m.ComboBox: Change event documentation improved

Change-Id: I3c7bbc6b1b910d712334df7a0ebc015b81f90985
BCP: 1970550657

SAP/openui5,SAP/openui5,SAP/openui5,SAP/openui5