[INTERNAL] sap.m.NavContainer: add comment explaining a workaround
[INTERNAL] sap.m.NavContainer: add comment explaining a workaround

The respective webkit bug still exists in supported devices, so the
workaround cannot be removed yet.

Change-Id: I742832b18400cbdb61608019d0f3a3250fc7b940

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