SYSML16 — UnitAndQuantityKind figure missing block keyword

In Figure 8.11 (Model library for Unit and QuantityKind), Unit and QuantityKind are blocks (at least according to the XMI), but they don't
have the block keyword showing.

*Add the block keyword to Unit and QuantityKind *

According to section 8.3.1.1.2 if no stereotype keyword appears within a definition box on a block definition diagram (including any stereotype property
compartments), then the definition is assumed to be a SysML block, exactly as if the «block» keyword had appeared before the name in the top compartment of the definition.

However, it is a good style to be very clear in a specification and the figure will be updated anyway (see SYSML16-334).