#2082: Update comments in docker-compose.yml

docker-compose.yml

@@ -49,6 +49,7 @@
 #
 # $ export COMPILER_TYPE=intel
 # $ export COMPILER=icpx
+# $ export HOST_COMPILER=icpx
 # $ export VT_TRACE=1
 # $ docker-compose pull ubuntu-cpp-interactive
 # $ docker-compose run ubuntu-cpp-interactive
@@ -67,7 +68,7 @@ version: '3.5'
 # Named volumes must be predefined according the docker compose rules. Many
 # combinations have already been added, but if a needed configuration is missing
 # add it to this list. For example, for ARM64v8 on Ubuntu 20.04 with clang-9,
-# add `arm64v8-ubuntu-20.04-clang-9-cache`.
+# add `arm64v8-ubuntu-20.04-clang-9-clang-9-cache`.
 volumes:
   amd64-ubuntu-18.04-clang-8-clang-8-cache:
   amd64-ubuntu-18.04-clang-9-clang-9-cache: