DROOLS-5931 DMN document with further examples decimal() built-in fn (#3316)
DROOLS-5931 DMN document with further examples decimal() built-in fn (#3316)

Align with docs review
https://github.com/kiegroup/kie-docs/pull/3130#pullrequestreview-565311606
winklerm/drools,manstis/drools,jomarko/drools,manstis/drools,manstis/drools,jomarko/drools,winklerm/drools,jomarko/drools,manstis/drools,winklerm/drools,jomarko/drools,winklerm/drools,manstis/drools,jomarko/drools,winklerm/drools