[INTERNAL][FIX] sap.m.CheckBox: API doc corrected
[INTERNAL][FIX] sap.m.CheckBox: API doc corrected

* The setSelected API method is missing in the Demokit,
* because the 'Public Method' comment used to break the doc creation
* as it does not contain the @public annotaion.

Change-Id: I354e202b2646b194b3299cd1bdab4175ca39bb86

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