Update proc_macro_attribute to use the attribute template #1889
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New rules:
macro.proc.attribute.syntaxmacro.proc.attribute.allowed-positionsmacro.proc.attribute.duplicatesmacro.proc.attribute.namespacemacro.proc.attribute.use-positionsmacro.proc.attribute.behaviorRenamed rules:
macro.proc.attribute.defsplit intomacro.proc.attribute.allowed-positionsandmacro.proc.attribute.behavior