Bug-53538: Manual requires clarification about the use of property/propertynames

git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@1478660 13f79535-47bb-0310-9956-ffa450edef68
Bug-53490: unrequired stuff breaks code formatting

git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@1478661 13f79535-47bb-0310-9956-ffa450edef68