dt-bindings: net: wireless: minor whitespace and name cleanups

Minor cleanups:
 - Drop redundant blank lines,
 - Correct indentaion in examples,
 - Correct node names in examples to drop underscore and use generic
   name.

No functional impact except adjusting to preferred coding style.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/20230118175413.360153-1-krzysztof.kozlowski@linaro.org