Modify rustc-dev-guide triagebot ping list

Author: Kobzol

triagebot.toml

@@ -1208,7 +1208,7 @@ project-exploit-mitigations = [
 "/src/doc/nomicon" =                                     ["@ehuss"]
 "/src/doc/reference" =                                   ["@ehuss"]
 "/src/doc/rust-by-example" =                             ["@ehuss"]
-"/src/doc/rustc-dev-guide" =                             ["@ehuss"]
+"/src/doc/rustc-dev-guide" =                             ["@kobzol"]
 "/src/doc/rustdoc" =                                     ["rustdoc"]
 "/src/doc/style-guide" =                                 ["style-team"]
 "/src/etc" =                                             ["@Mark-Simulacrum"]