remove sections of re-export

[ShahakShama]

Note

Low Risk
Low risk: documentation-only change with no impact on runtime behavior or APIs.

Overview
Deletes the Re-exports sections from style.md, removing previously documented guidance and examples discouraging internal and external pub use re-exports.

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[reviewable-StarkWare]

This change is 

[Stavbe]

@Stavbe reviewed 1 file and all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on ShahakShama).