Clarify Docker install step for WSL in .devcontainer README

[acosmicflamingo]

Description

Addresses #7508.

For WSL users, the .devcontainers' README is written in a way where it sounds like installing the VSCode Remote Development Extension Pack will automatically handle the Docker step, when in fact it will only handle automatically finding an already-installed Docker.

This PR clarifies the wording of the README so it explicitly states that Docker needs to be installed before installing the VSCode Remote Development Extension Pack.

Checklist

• I am familiar with the Contributing Guidelines.
• New or existing tests cover these changes.
• The documentation is up to date with these changes.

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[acosmicflamingo]

I wonder if it'd also be beneficial to steer WSL users to installing the Ubuntu distro. Based on these docs and the CUDA toolkit download center, it seems like Ubuntu is definitely the way to go.

[jrhemstad]

Thanks for keeping these instructions up to date! I swear when I originally wrote this doc that the Remote Development Extension would install Docker by default, but I see from the latest docs that this isn't the case.

[jrhemstad]

I wonder if it'd also be beneficial to steer WSL users to installing the Ubuntu distro. Based on these docs and the CUDA toolkit download center, it seems like Ubuntu is definitely the way to go.

It's always a delicate balance between trying to provide complete instructions in our own documentation vs deferring to other more authoritative documentation. As you've seen, the risk is that if we try and provide complete, detailed instructions, it's likely to eventually get stale. I think for this kind of guidance on what distro to select is better left to the docs at https://docs.nvidia.com/cuda/wsl-user-guide/index.html

[acosmicflamingo]

Gotcha; yes I agree. Thanks for the context 😊