[rules-dev] Empty modify blocks in Expert

[Wolfgang Laun]

http://docs.jboss.org/drools/release/6.1.0.Beta2/drools-docs/html_single/

Search for "modify" after "7.8.3.7.2. Conditional Element from", where
examples contain lines such as

    modify ($p) {} // Assign person to sales region 1 in a modify block

which is bound to cause confusion. These omissions continue until
"7.8.3.7.3. Conditional Element collect".

-W