This thread is almost 3 years old.
I for one find the documentation quite excellent and it is one of the main reasons I liked Construct to begin with. The manual is very precise and doesn't need to be bloated with examples everywhere. Plugins, behaviours, and expressions are flexible and able to serve many tasks. It would be ridiculous to try to cover all use cases with examples. And if not, then you run into the same problem where what you're specifically looking for might not have an example, as if you were searching on the forums or tutorials.
Certain new features or plugins might not be immediately documented, but those get entries pretty quickly, not to mention blog posts that explore the new features.
I wouldn't mind a method for centralizing the location of information. Sometimes I recall reading something useful and I can't remember if it came from a blog post, forum post, or tutorial.