[DOCS] Add missing ELASTIC_PASSWORD in docker-compose (elastic#112372)

This PR adds missing ELASTIC_PASSWORD environment variable to es02 and es03 nodes.

Resolves elastic#112235

Author: slobodanadamovic

docs/reference/setup/install/docker/docker-compose.yml

@@ -117,6 +117,7 @@ services:
       - cluster.name=${CLUSTER_NAME}
       - cluster.initial_master_nodes=es01,es02,es03
       - discovery.seed_hosts=es01,es03
+      - ELASTIC_PASSWORD=${ELASTIC_PASSWORD}
       - bootstrap.memory_lock=true
       - xpack.security.enabled=true
       - xpack.security.http.ssl.enabled=true
@@ -156,6 +157,7 @@ services:
       - cluster.name=${CLUSTER_NAME}
       - cluster.initial_master_nodes=es01,es02,es03
       - discovery.seed_hosts=es01,es02
+      - ELASTIC_PASSWORD=${ELASTIC_PASSWORD}
       - bootstrap.memory_lock=true
       - xpack.security.enabled=true
       - xpack.security.http.ssl.enabled=true