fix some type in ./docs/protocol-spec_zh.md
fix some type in ./docs/protocol-spec_zh.md

The PR was originally at https://github.com/hyperledger/fabric/pull/2331:wq

Change-Id: I3156607e12d72a3ca92ea5c4db2076bf61b8af68
Signed-off-by: dinghaiyang84 <7905f11102b746be0f1de519b2c598fa3b3bb4f3@gmail.com>

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