Minor changes in Section 8.5.2

Considering that the Contract element will be deprecated, the following changes are required on Example 26:

From "...consists of a contract “Insurance Policy” and a business service “Customer Service”..." to "... consists of a contract “Insurance Policy” (modeled as a business object) and a business service “Customer Service”..."

From "...and accompanying contract “Drive Well and Save Agreement”." to "... and accompanying contract “Drive Well and Save Agreement” (also modeled as a business object)."