Improve HomeKit description of what the PIN looks like

[gladhorn]

This would have saved me an hour of searching and wondering. Many homekit devices have the code next to the barcode it seems.

Breaking change

Proposed change

Add more information how to add homekit devices.

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[home-assistant]

Hey there @Jc2k, @bdraco, mind taking a look at this pull request as it has been labeled with an integration (homekit_controller) you are listed as a code owner for? Thanks!

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[gladhorn]

See also #67451

[bdraco]

Thanks @gladhorn

[Jc2k]

Maybe the docs could be updated to have examples of the different common stickers. I think older devices don't have the QR code and have the code with dashes in. Newer devices have the type with barcodes and they don't have dashes.

[bdraco]

https://cdn.mos.cms.futurecdn.net/KRs2Fs79EWERLNHe3Tp8tU.jpg