Not everyone has time to adhere to the specific coding styles for a project, so if you can't do a full blown pull-request, there is NOTHING wrong with opening a pull-request that only has the intention of showing the author how you solved the problem.

The best place to let the developers know, and track those bugs is in the bug tracker. There are hundreds of forums online, all over the place in many languages. We can’t be expected to read all of them. Anyone with a launchpad ID (thus, anyone who has an account on this discourse instance) has the capability to file a bug. I’d strongly recommend doing so, for each specific issue. Taking just a few minutes to do that will help tremendously.

People cannot see exhaustive documentation and code examples on their own file system. They would have to visit the repository (which also requires an internet connection).