fix: onPieceAdded arg type is Hex

[wjmelements]

Reviewer @hugomrdias
This fixes a minor issue where the transaction hash wasn't logged, and some other inconsistencies in docs and examples.
It seems this used to pass a transaction object and now it just passes the hash.

Changes

• fix onPieceAdded arg: transaction -> transactionHash

[wjmelements]

before the fix:

✓ [File 1/2] Piece addition transaction: undefined
✓ [File 2/2] Piece addition transaction: undefined

after:

✓ Piece addition transaction: 0xbb5d5e586075325caa750095488250640756b43c2267e04ac4230e4d1154a66f

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[rvagg]

I thought we changed this originally to be the transaction itself, so you could .wait() or do whatever else you wanted with it. It seems like an appropriate place to be passing a Transaction object so maybe this is an oversight?