Use a different symbol for each v5 Sapling field cardinality rule.
Use a different symbol for each v5 Sapling field cardinality rule.

Currently, the spec uses the double dagger symbol for both:
* present if and only if `nSpendsSapling + nOutputsSapling > 0`;
* present if and only if `nSpendsSapling > 0`.

To avoid confusion, use dagger for the first rule, and double dagger for the second rule.

Co-authored-by: teor <7df992f15bda7b1da3fd8c945aef2e4e5b1c226f@riseup.net>
Signed-off-by: Daira Hopwood <cd7d43d5556a38ce626d53826fddc46adc597539@jacaranda.org>

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