Updating the Window Controls Overlay docs

[captainbrosset]

Window Controls Overlay is shipping with Edge 105. So, I went over the docs written last year, and updated them.

Rendered docs for review:

• Before: https://docs.microsoft.com/en-us/microsoft-edge/progressive-web-apps-chromium/how-to/window-controls-overlay
• After: https://review.docs.microsoft.com/en-us/microsoft-edge/progressive-web-apps-chromium/how-to/window-controls-overlay?branch=pr-en-us-2149

[captainbrosset]

@diekus for info, here is an update for our WCO docs, in case you want to take a look.

[opbld33]

Docs Build status updates of commit 7bd2b7f:

✅ Validation status: passed

File	Status	Preview URL	Details
microsoft-edge/progressive-web-apps-chromium/how-to/window-controls-overlay.md	✅Succeeded	View
microsoft-edge/progressive-web-apps-chromium/media/my-tracks-draggable-titlebar.png	✅Succeeded	n/a (file deleted)
microsoft-edge/progressive-web-apps-chromium/media/my-tracks-titlebar.png	✅Succeeded	n/a (file deleted)
microsoft-edge/progressive-web-apps-chromium/media/my-tracks-titlebar-toggle.png	✅Succeeded	n/a (file deleted)
microsoft-edge/progressive-web-apps-chromium/media/vscode-titlebar.png	✅Succeeded	View
microsoft-edge/progressive-web-apps-chromium/media/wco-draggable-titlebar.png	✅Succeeded	View
microsoft-edge/progressive-web-apps-chromium/media/wco-reserved-titlebar.png	✅Succeeded	View
microsoft-edge/progressive-web-apps-chromium/media/wco-toggle-button.png	✅Succeeded	View

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Note: Broken links written as relative paths are included in the above build report. For broken links written as absolute paths or external URLs, see the broken link report.

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