Fix incorrect JS slice in ERC-20 example

[0x4tl4nt]

Description

Fixed issues in the ERC-20 transfer example regarding the generation of the function selector:

• The original example used the incorrect syntax [0..4] in JavaScript. It has been corrected to use .slice(0, 10) to correctly extract the first 4 bytes of the hash plus the 0x prefix.

• The example incorrectly used the Transfer event as if it were a function for sending tokens. Transfer is an ERC-20 event, not a function, and cannot be called directly. The example has been updated to generate the selector for the correct transfer(to,value) function.

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Note

Updates the ERC-20 "Send transactions" example to correctly derive the transfer(address,uint256) function selector.

• Replaces deprecated/incorrect web3.sha3("Transfer(address, address, uint256)")[0..4] with web3.utils.sha3("transfer(address,uint256)").slice(0, 10) for proper 4-byte selector extraction

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