Rollup merge of rust-lang#142298 - jieyouxu:loongarch-maintainer-list, r=fee1-dead

Make loongarch-none target maintainers more easily pingable

In the same style as rust-lang#139028.
r? compiler

Author: matthiaskrgr

src/doc/rustc/src/platform-support/loongarch-none.md

@@ -11,8 +11,8 @@ Freestanding/bare-metal LoongArch binaries in ELF format: firmware, kernels, etc
 
 ## Target maintainers
 
-- [@heiher](https://github.com/heiher)
-- [@xen0n](https://github.com/xen0n)
+[@heiher](https://github.com/heiher)
+[@xen0n](https://github.com/xen0n)
 
 ## Requirements