docs: dt: Make 'Devicetree' wording more consistent

There's a variety of ways 'Devicetree' has been written. This is most
evident in the documentation build contents where we have 'Device Tree',
'DeviceTree', etc. The DT spec has somewhat standardized on
'Devicetree', so let's use that.

Cc: Frank Rowand <[email protected]>
Cc: Mauro Carvalho Chehab <[email protected]>
Signed-off-by: Rob Herring <[email protected]>
Reviewed-by: Mauro Carvalho Chehab <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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