fix typos and improve clarity

[Alex-Roleks]

This PR corrects several typos and improves clarity in documentation across multiple files in the cairo-lang-lowering crate. Key fixes include:

• Correcting spelling mistakes such as rather then → rather than and allow → allows.
• Improving phrasing for better readability we need the make sure → we need to ensure.
• Deleted extra space in comment section.

[reviewable-StarkWare]

This change is 

[orizi]

Reviewed 3 of 4 files at r1, all commit messages.
Reviewable status: 3 of 4 files reviewed, 1 unresolved discussion

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crates/cairo-lang-lowering/src/lower/refs.rs line 14 at r1 (raw file):

use crate::db::LoweringGroup;

// Information about members captured by the closure and their types.

Suggestion:

/// Information about members captured by the closure and their types.

[Alex-Roleks]

Updated file refs.rs according to your suggestion.

[orizi]

Reviewed 1 of 1 files at r2, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @Alex-Roleks)

[orizi]

Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @Alex-Roleks)