Flash Professional CC 2013 (released in June 2013 with build number 13.0.x.x) does not have HTML 5 Canvas document type but got introduced in Flash Professional 2013 December(with build number 13.1.x.x). Please verify the build number of your Flash Professional CC copy via Help>About Flash
Also please install the latest version Flash Professional CC i.e. Flash Professional CC 2014 October release(build number 184.108.40.206) to take advantage of multiple feature sets including HTML 5 Canvas and WebGL document types.
If you have a valid Creative Cloud subscription you can install the latest version. You can learn more about the latest release at http://www.adobe.com/products/flash/features.html