Updated docs icons to use the newly created placeholder icon

[patricklafrance]

Summary

End of the day and was too tired to start something new so I've decided to update the docs example icons to use the newly created placeholder icon!

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[fraincs]

I would have expected a placeholder icon here. Although this one open to debate as it might means that you can edit the input.

[patricklafrance]

I would have expected a placeholder icon here. Although this one open to debate as it might means that you can edit the input.

Yeah, wasn't sure, the pencil kind of made sense