VSCode Instruction improvements for scalar/sequence intrinsics

[kddejong]

Thanks to Wayne for pointing this out but there are some improvements that could be made for the scalar/sequences for intrinsics.

aws-cloudformation/cfn-lint-visual-studio-code#46

[PatMyron]

looks merged into the VSCode extension in this PR. Started recommending the extension here, but might as well not leave this outdated as well:

https://github.com/aws-cloudformation/aws-cloudformation-template-schema/blob/6ee1ccd8a9e2efd3e41c8d3b6028ea138a4c971a/docs/vscode/instructions.md#L32-L49