make help: improve description

Dockerfile.cuda

@@ -54,8 +54,6 @@ RUN pip3 install nvidia-pyindex \
     done \
  && ldconfig
 # gputil/nvidia-smi would be nice, too – but that drags in Python as a conda dependency...
-RUN ldconfig
-
 
 WORKDIR /data
 

Makefile

@@ -32,13 +32,13 @@ help:
 	@echo "    docs-clean     Clean docs"
 	@echo "    docs-coverage  Calculate docstring coverage"
 	@echo "    docker         Build docker image"
-	@echo "    docker-cuda    Build docker GPU / CUDA image"
+	@echo "    docker-cuda    Build docker image for GPU / CUDA"
 	@echo "    pypi           Build wheels and source dist and twine upload them"
 	@echo ""
 	@echo "  Variables"
 	@echo ""
-	@echo "    DOCKER_TAG         Docker tag. Default: '$(DOCKER_TAG)'."
-	@echo "    DOCKER_BASE_IMAGE  Docker base image. Default: '$(DOCKER_BASE_IMAGE)'."
+	@echo "    DOCKER_TAG         Docker target image tag. Default: '$(DOCKER_TAG)'."
+	@echo "    DOCKER_BASE_IMAGE  Docker source image tag. Default: '$(DOCKER_BASE_IMAGE)'."
 	@echo "    DOCKER_ARGS        Additional arguments to docker build. Default: '$(DOCKER_ARGS)'"
 	@echo "    PIP_INSTALL        pip install command. Default: $(PIP_INSTALL)"