Improve mount limitations documentation

[guillermo]

Mounting disk or partitions belonging to a disk that is already in use is not an option and is the cause of several issues: #5997 #6015.

This patch updates the documentation to inform about the limitations of the command, preventing future users from discovering this too late.

[opbld32]

Docs Build status updates of commit 493417f:

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[guillermo]

After a comment from @OneBlue in microsoft/WSL#6015 (comment) I realize that the documentation informs about the limitations at the button of the page in the limitations section.

It felt for me as a step by a step guide. This kind of guide has limitations, and disclaimers at the beginning, from that point of view, for me this commit still makes sense. But I don't know how wide is this interpretation.

[craigloewen-msft]

@OneBlue please sign off and merge if the info looks good here!

[OneBlue]

LGTM.

A couple minor changes and let's merge it.

[mattwojo]

Merging. Thanks @guillermo!!

[opbld31]

Docs Build status updates of commit 3a6f109:

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[opbld30]

Docs Build status updates of commit 62e8b01:

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WSL/wsl2-mount-disk.md	✅Succeeded	View

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