only a few are needed as examples

Author: tshepang

src/backend/updating-llvm.md

@@ -177,12 +177,6 @@ so let's go through each in detail.
 
    <!-- date-check: Sep 2024 -->
    > For prior art, here are some previous LLVM updates:
-   > - [LLVM 11](https://github.com/rust-lang/rust/pull/73526)
-   > - [LLVM 12](https://github.com/rust-lang/rust/pull/81451)
-   > - [LLVM 13](https://github.com/rust-lang/rust/pull/87570)
-   > - [LLVM 14](https://github.com/rust-lang/rust/pull/93577)
-   > - [LLVM 15](https://github.com/rust-lang/rust/pull/99464)
-   > - [LLVM 16](https://github.com/rust-lang/rust/pull/109474)
    > - [LLVM 17](https://github.com/rust-lang/rust/pull/115959)
    > - [LLVM 18](https://github.com/rust-lang/rust/pull/120055)
    > - [LLVM 19](https://github.com/rust-lang/rust/pull/127513)