Added updates to wsl mount docs

[craigloewen-msft]

Based on some customer feedback I've slightly rearranged and added some images to the mount docs to make the user flow for a new user clearer.

[opbld30]

Docs Build status updates of commit d0db434:

❌ Validation status: errors

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[mattwojo]

Nice! These changes look great!

[opbld32]

Docs Build status updates of commit 5910f69:

✅ Validation status: passed

File	Status	Preview URL	Details
WSL/media/wslmountsimple.png	✅Succeeded	View
WSL/media/wslmountvhd.png	✅Succeeded	View
WSL/wsl2-mount-disk.md	✅Succeeded	View

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[craigloewen-msft]

Added in your edits @OneBlue thanks for the review! I'lll merge this over. to the main branch.