Mention missing 1.38.0 change in RELEASES.md
Mention missing 1.38.0 change in RELEASES.md

Mention that doc comments on `pub use` statements are prepended to the documentation of the reexported item
aidancully/rust,graydon/rust,graydon/rust,aidancully/rust,aidancully/rust,graydon/rust,graydon/rust,aidancully/rust,aidancully/rust,aidancully/rust,graydon/rust,graydon/rust