Added picture to TURN changing FAQ (#17744)

* added picture to TURN changing FAQ

* reprocessed svg

* replaced svg with png

---------

Co-authored-by: Nils Ohlmeier <[email protected]>

Author: nils-ohlmeier

src/assets/images/calls/turn-charging.png

@@ -21,6 +21,11 @@ There is a free tier of 1,000 GB before any charges start. This free tier includ
 
 Traffic between Cloudflare Calls TURN and Cloudflare Calls SFU or Cloudflare Stream (WHIP/WHEP) does not incur any charges.
 
+<div class="full-img">
+
+![TURN charging illustration](~/assets/images/calls/turn-charging.png)
+
+</div>
 
 
 ### Is Calls TURN HIPAA/GDPR/FedRAMP compliant?