Update attach-to-process-running-in-docker-container.md

[sbonds]

I tried to keep it concise, but the idea is that this process needs to be done first:

https://learn.microsoft.com/en-us/cpp/linux/connect-to-your-remote-linux-computer?view=msvc-170

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@Mikejo5000
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[Mikejo5000]

@sbonds Thanks for the contribution! It looks like you can access the Connect to Remote System dialog either from Select Docker Container > Add (as currently described in the article), or from Tools > Options > Cross-Platform > Connection Manager. Is there a reason you think the Connection Manager step is required here? fyi @gregg-miskelly