DOC-4629 Added one more resolved issue to release notes

Author: rrelledge

content/operate/rs/release-notes/rs-7-8-releases/rs-7-8-4-18.md

@@ -106,6 +106,8 @@ The following table shows which Redis modules are compatible with each Redis dat
 
 - RS136270: Changed the owner and group of the `rlec_supervisor.service` file to `root:root` instead of `redislabs:redislabs` to improve security.
 
+- RS142166 - Fixed the representation of available RAM.
+
 ## Version changes
 
 ### Supported platforms