This was handled in #2674, and I think it's handled well enough to close this. It's still a but odd that we talk about a URL that doesn't work, but the only other solution is to not talk about the production environment at all, which would be a shame.

I thought about it a bit when I made the changes. I don't really much like that section at all, even with the revisions; it's doing too much. It seems to me we've actually got three sections here: one on the theory of environments ("environments represent a set of configuration and bundles to be loaded"), one on the practical aspects (the bit on caches; you don't want the profiler running in prod, etc), and one on the profiler (which probably deserves its own section of the documentation). Possibly, list Environments as one of the "fundamentals" to give it some introduction before more details on the practical aspects of environments in the "Working with Environments" section.

If that sounds reasonable, I'll take a stab at rewriting that whole section.

My opinions:

👍 for seperating webprofiler and environments (please note that the second url is wrong, it should get fixed)
👍 for talking about production environment in quick tour
👍 for creating less-advanced profiler articles in cookbook/profiler
👎 for removing profiler stuff from the quick tour

That PR should substantially improve that part of the quickstart. We can loop back on a profiler cookbook section separately.

This has been completed in #2823. I've also made big changes to the document in sha: 72072e9

Thanks!