[INTERNAL] sap.ui.core: Improve deprecation text of Core.getUIArea
[INTERNAL] sap.ui.core: Improve deprecation text of Core.getUIArea

JIRA: CPOUI5FRAMEWORK-417
Change-Id: Iea705b6d17c4929619b6d0ebaaeeb4606ec727f6

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