Improve Initializable docstrings (#3704)
Improve Initializable docstrings (#3704)

Co-authored-by: tincho <85aed0228fd7c95a745ddea5a0f84964db8fb2b1@noreply.users.github.com>
Co-authored-by: Francisco Giordano <4223852eec80914c4c190cdc031e06592b151a67@gmail.com>
OpenZeppelin/openzeppelin-contracts,OpenZeppelin/openzeppelin-contracts,OpenZeppelin/openzeppelin-contracts