NIFI-14828 Noted removal of plain HTTP support in Docker README for 2.0.0 (#10178)

Signed-off-by: David Handermann <[email protected]>

Author: peter279k

nifi-docker/dockerhub/README.md

@@ -18,6 +18,7 @@
 ### 2.0.0
 
 - Changed base image to bellsoft/liberica-openjdk-debian:21 as NiFi 2.0.0 requires Java 21
+- Dropped the plain HTTP support
 
 ### 1.19.0