Use provide_both link instead of provide(_extern)

Author: JohnTitor

src/query.md

@@ -155,13 +155,11 @@ providers**. Almost all **extern providers** wind up going through the
 [`rustc_metadata` crate][rustc_metadata], which loads the information
 from the crate metadata. But in some cases there are crates that
 provide queries for *both* local and external crates, in which case
-they define both a [`provide`][ext_provide] and a
-[`provide_extern`][ext_provide_extern] function that `rustc_driver`
-can invoke.
+they define both a `provide` and a `provide_extern` function, through
+[`provide_both`][ext_provide_both], that `rustc_driver` can invoke.
 
 [rustc_metadata]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_metadata/index.html
-[ext_provide]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_codegen_llvm/attributes/fn.provide.html
-[ext_provide_extern]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_codegen_llvm/attributes/fn.provide_extern.html
+[ext_provide_both]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_codegen_llvm/attributes/fn.provide_both.html
 
 ### Adding a new kind of query