DMN12 — add richer variety of DT examples in Ch 11

We lack examples of input expressions that are not simple names, input entries that reference variables, and output entries that are more than simple values.
For example, could change fig 67, Eligibility column, from Eligibility||INELIGIBLE|ELIGIBLE to Eligibility=ELIGIBLE||false|true
In Fig 71, add a context entry with name 'Adult' and value '18'. Change the entry <18 to <Adult.
In Fig 83, rename to Adjusted Disposable Income. Add parameter list (Risk Category, Disposable Income). Change output entries to 0.6 * Disposable Income, 0.7 * Disposable Income, 0.8 * Disposable Income, change invocation entry in Fig 82 name to Adjusted Disposable Income and pass Disposable Income. Change Affordability calculation to 'if Adjusted Disposable Income > Required Monthly Installment'

add more examples

more suggested examples