rustc/query: tweak comments on hir_owner{,_nodes}.
rustc/query: tweak comments on hir_owner{,_nodes}.

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