Fix doc for RWLock #21
Description
https://docs.rs/micro_types/0.2.3/dtypes/redis/struct.RwLock.html
It writes about threading usage, but it does not help in this case, because it is redis backed.
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https://docs.rs/micro_types/0.2.3/dtypes/redis/struct.RwLock.html
It writes about threading usage, but it does not help in this case, because it is redis backed.