Fix comment as why we need apt install

Dockerfile

@@ -4,7 +4,7 @@ RUN mkdir /src
 COPY . /src/
 ENV VIRTUAL_ENV=/opt/venv
 ENV HATCH_BUILD_HOOKS_ENABLE=1
-# Install build tools to compile dependencies that don't have prebuilt wheels
+# Install build tools to compile black + dependencies
 RUN apt update && apt install -y build-essential git python3-dev
 RUN python -m venv $VIRTUAL_ENV
 RUN python -m pip install --no-cache-dir hatch hatch-fancy-pypi-readme hatch-vcs