Title: Adding the Business Rule Task

Describe the issue: paragraph 6.2: The name of the ruleflow group is inconsistent with the previous paragraph. This causes the business rule to not execute correctly a.k.a. not according to the description in the doc.

Suggestions for improvement:
In paragraph 6.1, step 3, specify the ruleflow-group value as "helloWorldGroup" instead of "helloworld".

Additional information:
Red Hat JBoss BPM Suite 6 Getting Started Guide edition 1.
Seems duplicate of bug 1059342.