specs: Update `withdrawals` spec#4056

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trianglesphere merged 6 commits intodevelopfrom

clabby/specs/two-step-withdrawals

Dec 2, 2022

Commits on Nov 22, 2022

Commits on Nov 23, 2022

Change signature of L2OutputOracle function
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Commits on Nov 24, 2022

Fix list numbering
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Commits on Nov 30, 2022

Merge branch 'develop' into clabby/specs/two-step-withdrawals
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Add link to `Types.WithdrawalTransaction` & `Types.OutputRootProof`
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