Added valid inputs to the type field in attributions on block-attributes.md

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Co-Authored-By: Chris Van Patten <hello@chrisvanpatten.com>

I was advised by the core contributors to either add a definition for number, or delete the definition for integer. After noting that a definition of number (either an integer or floating point number) could create more confusion, I opted for the latter choice.

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Co-Authored-By: Chris Van Patten <hello@chrisvanpatten.com>