[docs] remove incorrect pubkey param from getEpochInfo

[mcintyre94]

This PR removes an incorrect address parameter from the docs for getEpochInfo

Relevant source code:

solana/rpc-client/src/rpc_client.rs

Lines 2733 to 2735 in bac4d50

	pub fn get_epoch_info(&self) -> ClientResult<EpochInfo> {
	self.invoke((self.rpc_client.as_ref()).get_epoch_info())
	}

solana/rpc-client/src/rpc_client.rs

Lines 2758 to 2763 in bac4d50

	pub fn get_epoch_info_with_commitment(
	&self,
	commitment_config: CommitmentConfig,
	) -> ClientResult<EpochInfo> {
	self.invoke((self.rpc_client.as_ref()).get_epoch_info_with_commitment(commitment_config))
	}

As far as I can tell there's no path where an address is used in the getEpochInfo call

In addition making the RPC call:

{
    "jsonrpc": "2.0",
    "id": 1,
    "method": "getEpochInfo",
    "params": [
        "H3BRzVGdedrBQD9wFitEbzEBhRoPXTemopuvS8AcNxLy"
    ]
}

Gives the error:

    "error": {
        "code": -32602,
        "message": "Invalid params: invalid type: string \"H3BRzVGdedrBQD9wFitEbzEBhRoPXTemopuvS8AcNxLy\", expected struct RpcContextConfig."
    },

[CriesofCarrots]

Ah sorry, I saw the notification on this come through, but I see you've already requested a reviewer. I'll defer :)