Add autocorrect when sig is missing argument from method def

[jez]

Input

→ View on sorbet.run

# typed: true
extend T::Sig

sig {params(x: Integer).void}
def foo(x, y)
end

Observed output

editor.rb:5: Malformed sig. Type not specified for argument y https://srb.help/5003
     5 |def foo(x, y)
                   ^
    editor.rb:4: Signature
     4 |sig {params(x: Integer).void}
        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Errors: 1

Expected behavior

The error is right, but we could make it better by offering an autocorrect to fix the sig.

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