Add docs informing about gotcha of clients (#21262)

* Add docs informing about gotcha of clients

It is a hidden problem that AsyncHttpClient-instances *can not* deal with multiple requests at once.
Similar to normal HttpClients they can only deal with sending one request at a time.
This is not told anywhere in the documentation, but critical information that should be available to the user.

* Update lib/pure/httpclient.nim

fixes typo

Co-authored-by: ringabout <43030857+ringabout@users.noreply.github.com>

Co-authored-by: ringabout <43030857+ringabout@users.noreply.github.com>

0 files changed, 0 insertions, 0 deletions