feedback from Paul Marfleet

[ChrisBrooksbank]

The articles would benefit from proofreading. I noticed some spelling mistakes, particularly with regard to asynchronous methods. The async article could also be improved by explaining the differences between IO-bound and CPU-bound calls, and when it is appropriate to use each one. This is of particular importance when it comes to web development, where appropriate use of asynchronous methods is not always understood by developers.