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doc: document constructors of TransparencyMode (#3037)

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Taken from
https://github.com/leanprover-community/lean4-metaprogramming-book/blob/master/md/main/04_metam.md#transparency

I can never remember which way around `reducible` and `default` go, and
this avoids me needing to leave the editor to find out.
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Eric Wieser 2023-12-07 17:04:40 +00:00 • committed by GitHub
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9
src/Init/MetaTypes.lean
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@ -21,7 +21,14 @@ structure Module where
namespace Meta
inductive TransparencyMode where
| all | default | reducible | instances
/-- unfold all constants, even those tagged as `@[irreducible]`. -/
| all
/-- unfold all constants except those tagged as `@[irreducible]`. -/
| default
/-- unfold only constants tagged with the `@[reducible]` attribute. -/
| reducible
/-- unfold reducible constants and constants tagged with the `@[instance]` attribute. -/
| instances
deriving Inhabited, BEq
inductive EtaStructMode where