[SIL] Update integer_literal formatting in docs
[SIL] Update integer_literal formatting in docs

Fixes the formatting for integer_literal in the documentation so that it
conforms with the SIL grammar.

khizkhiz/swift,khizkhiz/swift,khizkhiz/swift,khizkhiz/swift,khizkhiz/swift,khizkhiz/swift,khizkhiz/swift