[INTERNAL][FIX] uxap.BlockBase: showSubSectionMore not supported in nested block
[INTERNAL][FIX] uxap.BlockBase: showSubSectionMore not supported in nested block

- API doc updated

Change-Id: I7e54793c3831fccec295f00972d00d9e6ef7aec5
BCP: 1670560032

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