SwTxtNode::RstTxtAttr() depends on some implementation details..
SwTxtNode::RstTxtAttr() depends on some implementation details..

... of the hints array, attempt to document those with assertions.

Change-Id: I5e0310e7a213c7c8fd2e1f992ae91b739a7923a5

JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core