Incorrect schema for `MerkleTree`

[0x009922]

In the schema, MerkleTree<T> is represented as Vec<HashOf<T>>:

iroha/docs/source/references/schema.json

Lines 2835 to 2843 in 884f870

	"MerkleTree<SignedTransaction>": {
	"Vec": "HashOf<SignedTransaction>"
	},
	"MerkleTree<TransactionEntrypoint>": {
	"Vec": "HashOf<TransactionEntrypoint>"
	},
	"MerkleTree<TransactionResult>": {
	"Vec": "HashOf<TransactionResult>"
	},

While MerkleTree<T> is actually encoded as Vec<Option<HashOf>>:

iroha/crates/iroha_crypto/src/merkle.rs

Line 32 in 884f870

pub struct MerkleTree<T>(Vec<Option<HashOf<T>>>);