Update solidity-scripting.md

[duelinggalois]

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Instructions imply that the startBroadcast function takes a uint256 rather than an address

    // Has all subsequent calls (at this call depth only) create transactions that can later be signed and sent onchain
    function startBroadcast(address) external;

[duelinggalois]

hmm, there are functions for both:

https://github.com/foundry-rs/forge-std/blob/master/src/Vm.sol#L113-L116

but should probably be mentioned here

Looks like my version is out of date so I don't have that function signature.

   add41d3..2a2ce36  master                -> origin/master