docs: clarify the interplay between inheritance and the Initializable contract

contracts/proxy/utils/Initializable.sol

@@ -35,8 +35,11 @@ import "../../utils/Address.sol";
  * TIP: To avoid leaving the proxy in an uninitialized state, the initializer function should be called as early as
  * possible by providing the encoded function call as the `_data` argument to {ERC1967Proxy-constructor}.
  *
- * CAUTION: When used with inheritance, manual care must be taken to not invoke a parent initializer twice, or to ensure
- * that all initializers are idempotent. This is not verified automatically as constructors are by Solidity.
+ * CAUTION: while Solidity takes care of automatically invoking the constructors of all ancestors of a contract and
+ * doing it just once, the same does not apply to initializer functions. Instead, you need to take special care to
+ * manually call the initializer functions of all parent contracts and ensure they are either called no more than once
+ * or designed to be idempotent. Additionally, please note that the initializer modifier can only be called once, even
+ * when utilizing inheritance. Therefore, parent contracts should utilize the onlyInitializing modifier.
  *
  * [CAUTION]
  * ====