[swift-evolution] Change subscripts to use colons

[James Froggatt]

Submitted!

Pull request: https://github.com/apple/swift-evolution/pull/423 <https://github.com/apple/swift-evolution/pull/423>

Proposal doc: https://github.com/MutatingFunk/swift-evolution/blob/aa1fd53ec62b162f4cdefa9bd3845e13ac6f0d8d/proposals/NNNN-use-colons-for-subscript-type-declarations.md <https://github.com/MutatingFunk/swift-evolution/blob/aa1fd53ec62b162f4cdefa9bd3845e13ac6f0d8d/proposals/NNNN-use-colons-for-subscript-type-declarations.md>
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