Update text of *Utility*

[j---]

Should use proper decision point names, right?

In https://github.com/CERTCC/SSVC/pull/370/files/083057d3d22b89f5309d9685428981d3f26a9713#diff-1aa025f17397e8e205d3bd93b041e65477a806878e53a8f9e71a08454339d1ab

So "Value Density" instead of "value".
Suggest being a little more explicit
"Answer to Automatable is No and answer to Value Density is Diffuse " or something like that? Is there a reason for the way this is written more tersely / informally?

Originally posted by @j--- in #370 (comment)

[ahouseholder]

Note that this change needs to be made in the python object where Utility is defined, not in the Markdown files.