GHC.Wasm.Prim is only exposed via `ghc-internal`

In b8997080 @TerrorJack added documentation which suggests that GHC.Wasm.Prim is intended for use by end-users despite being available only from ghc-internal. This would be in violation of our agreement with the CLC which stipulates that we shall not expect users to rely on things being exposed from ghc-internal. Instead, GHC.Wasm.Prim should be exposed either from ghc-experimental or base.

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