SIMPLELINK-CC2640R2-SDK: "Using cache as ram" documentation in CC2640R2-SDK 4_40_00_10

Part Number: SIMPLELINK-CC2640R2-SDK

Hi guys.

In version 4.20.00.04 of the SIMPLELINK-CC2640R2 I can to find the documentation about "Using cache as ram " on the link https://dev.ti.com/tirex/content/simplelink_cc2640r2_sdk_4_20_00_04/docs/blestack/ble_user_guide/html/ble-stack-common/cache-as-ram.html 

However I am not able to find this documentation in the version 4_40_00_10.
Why was "Using cache as ram" documentation removed?

Thank you in advanced.