Wrong variable name in query-evaluation-model-in-detail.md

[SarthakSingh31]

https://github.com/rust-lang/rustc-guide/blob/9b3803d35d0e9ee80c0b42ee58ed472b16f06ea8/src/queries/query-evaluation-model-in-detail.md#L117-L123

let list_of_items should be let list_of_hir_items
or
for item_def_id in list_of_hir_items { should be for item_def_id in list_of_items {

[mark-i-m]

@SarthakSingh31 Thanks for the report :)

Would you mind opening a PR to fix this? The compiler is constantly under development, so things become outdated sometimes.

[SarthakSingh31]

@mark-i-m I created a pull request.