ingester.chunk-encoding disappeared in v1.14.0

[friedrichg]

Describe the bug
A flag was removed but it wasn't mentioned in the CHANGELOG

To Reproduce
Steps to reproduce the behavior:

docker run cortexproject/cortex:v1.13.2 -ingester.chunk-encoding
flag needs an argument: -ingester.chunk-encoding

docker run cortexproject/cortex:v1.14.0 -ingester.chunk-encoding
flag provided but not defined: -ingester.chunk-encoding

Expected behavior
All the flags removed should be mentioned in the CHANGELOG