cmd/golangorg: fix local docker instructions

Change-Id: Iada6af41a5831af6ff2a5d1e3459529992eb95d3
Reviewed-on: https://go-review.googlesource.com/c/website/+/290229
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
Trust: Bryan C. Mills <bcmills@google.com>

cmd/golangorg/README.md

@@ -45,10 +45,10 @@ In another terminal window, run the container:
 
 	docker run --rm \
 		--net host \
-		--env GODOC_REDIS_ADDR=localhost:6379 \
+		--env GOLANGORG_REDIS_ADDR=localhost:6379 \
 		--env DATASTORE_EMULATOR_HOST=$DATASTORE_EMULATOR_HOST \
 		--env DATASTORE_PROJECT_ID=$DATASTORE_PROJECT_ID \
-		gcr.io/golang-org/godoc
+		gcr.io/golang-org/golangorg
 
 It serves on localhost:8080.