refer BAPL-1790

And update PMML document with a note indicating the deprecation of kie-pmml

Impacted sections in the Developing Decision Services in Red Hat Decision Manager

RHPAM sections:

• 4.3.2. Including PMML models within a DMN file in Business Central
• 11.1. Embedding a PMML call directly in a Java application
• 11.2. Executing a PMML model using KIE server

RHDM sections:

• 4.3.2. Including PMML models within a DMN file in Business Central
• 11.1. Embedding a PMML call directly in a Java application
• 11.2. Executing a PMML model using KIE server

Drools sections:

• 5.3.3.2. Including PMML models within a DMN file in Business Central
• 6.4.1. Embedding a PMML call directly in a Java application
• 6.4.2. Executing a PMML model using KIE Server
• Drools release note