Let nils know about changes to target docs

Author: Noratrieb

triagebot.toml

@@ -709,6 +709,9 @@ cc = ["@rust-lang/project-exploit-mitigations", "@rcvalle"]
 [mentions."src/doc/unstable-book/src/compiler-flags/check-cfg.md"]
 cc = ["@Urgau"]
 
+[mentions."src/doc/rustc/src/platform-support"]
+cc = ["@Nilstrieb"]
+
 [mentions."tests/codegen/sanitizer"]
 cc = ["@rust-lang/project-exploit-mitigations", "@rcvalle"]