Packt class issues

[tigersabre]

Doing the Packt class for which this is a part of, some feedback:

• On both _expand and _embed parameters, it's not clear why or how a beginner will understand that profiles is a child of blogposts, or that blogposts is a parent of comments.
• It's also not clear why blogpost is written in the singular rather than plural when invoking the parent with _expand - is the singular specified somewhere?