As the above poster noted, your application is not 'closed' until you use your PR visa to 'land' in Canada. When you land, the border official will ask you if there have been any changes in your family status. If you say 'no' and therefore land as single, you will never be able to sponsor your wife. The documents you received clearly state that you must report all changes in your family to CIC.
Getting married after one has the PR visa but before landing is the worst possible time. It leaves you with one choice: tell CIC and the visa office you have gotten married. They will rescind your PR visa, you will then add your wife to your application, and they will issue you two new visas.