[INTERNAL] sap.m.ComboBoxBase: minor documentation improvement
[INTERNAL] sap.m.ComboBoxBase: minor documentation improvement

Change-Id: I81908517e61c5ae1eb0c552ac6a24856c5f89ebf

SAP/openui5,SAP/openui5,nzamani/openui5,SQCLabs/openui5,cschuff/openui5,cschuff/openui5,olirogers/openui5,nzamani/openui5,cschuff/openui5,nzamani/openui5,SAP/openui5,SQCLabs/openui5,SQCLabs/openui5,olirogers/openui5,SAP/openui5,olirogers/openui5