Rollup merge of #90758 - joseph-roitman:fix-entry-doc-key-ref, r=dtolnay
Rollup merge of #90758 - joseph-roitman:fix-entry-doc-key-ref, r=dtolnay

Fix collections entry API documentation.

I found some documentation that seems out of date.

aidancully/rust,aidancully/rust,graydon/rust,graydon/rust,aidancully/rust,aidancully/rust,graydon/rust,graydon/rust,aidancully/rust,graydon/rust,graydon/rust,aidancully/rust