SYSML11 — Section: 8.3.2 Unit/Dimension Notation

I miss a explicit statement that SysML changes the standard notation for instance specifications. According to that the name of dimensions and units must be underlined

As the issue notes, the notation that SysML defines for Dimension and Unit differs the standard UML notation for InstanceSpecification. Revise the subsection for Unit and Dimension under 8.3.1 Diagram Extensions to describe the specific notation that SysML defines for these two elements. Revise the text for how stereotype properties of Unit and ValueType reference these elements.