doc: fix type-layout.adoc clarity (u256 hex, enum selector, snapshot)

[eytan-starkware]

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[eytan-starkware]

• doc: fix type-layout.adoc clarity (u256 hex, enum selector, snapshot) #9766 👈 (View in Graphite)
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PR Summary

Low Risk
Documentation-only edits with no runtime or API impact; low risk aside from potential reader confusion if the new examples are incorrect.

Overview
Updates type-layout.adoc to fix the u256 256-bit hex example so the shown low/high 128-bit limbs match the stated memory layout.

Rewords the Snapshot<T> section to explicitly state that @T stores a full copy (not a pointer/reference) and explains that this is why snapshots are always Copy-able even when T is not.

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[orizi]

@orizi reviewed 1 file and all commit messages, and made 1 comment.
Reviewable status: all files reviewed, 1 unresolved discussion (waiting on eytan-starkware and TomerStarkware).

---

docs/reference/src/components/cairo/modules/language_constructs/pages/type-layout.adoc line 120 at r1 (raw file):

- **1-2 variants:** Selector is the variant index (0 or 1)
- **3+ variants:** Selector is a felt252-encoded jump offset used by the runtime

Suggestion:

- **3+ variants:** Selector is a jump offset used by the runtime

[eytan-starkware]

@eytan-starkware made 1 comment.
Reviewable status: all files reviewed, 1 unresolved discussion (waiting on orizi and TomerStarkware).

---

docs/reference/src/components/cairo/modules/language_constructs/pages/type-layout.adoc line 120 at r1 (raw file):

- **1-2 variants:** Selector is the variant index (0 or 1)
- **3+ variants:** Selector is a felt252-encoded jump offset used by the runtime

Done.

[orizi]

@orizi reviewed 1 file and all commit messages, made 1 comment, and resolved 1 discussion.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on TomerStarkware).

[TomerStarkware]

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Reviewable status: complete! all files reviewed, all discussions resolved (waiting on eytan-starkware).