chore: fix some minor issues in the comments

[goldlinker]

fix some minor issues in the comments

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[reviewable-StarkWare]

This change is 

[orizi]

@orizi reviewed 4 files and all commit messages, and made 1 comment.
Reviewable status: all files reviewed, 1 unresolved discussion (waiting on @goldlinker).

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crates/cairo-lang-defs/src/patcher.rs line 234 at r1 (raw file):

pub struct ModifiedNode<'db> {
    /// Children of the node.
    /// Can be None, in which case this is an empty node (of width 0). This is not the same as

this fix is wrong.
children if a None modified node can be modified (but do nothing). where children of an empty vec![] will not be found and will panic.