rustc-dev-guide changes ping group

Author: BoxyUwU

Diff for: triagebot.toml

@@ -990,6 +990,10 @@ https://github.com/rust-lang/reference/blob/HEAD/src/identifiers.md.
 """
 cc = ["@ehuss"]
 
+[mentions."src/doc/rustc-dev-guide"]
+message = "The rustc-dev-guide subtree was changed. If this PR *only* touches the dev guide consider submitting a PR directly to [rust-lang/rustc-dev-guide](https://github.com/rust-lang/rustc-dev-guide/pulls) otherwise thank you for updating the dev guide with your changes."
+cc = ["@BoxyUwU", "@jieyouxu", "@kobzol"]
+
 [assign]
 warn_non_default_branch.enable = true
 contributing_url = "https://rustc-dev-guide.rust-lang.org/getting-started.html"
@@ -1208,7 +1212,7 @@ project-exploit-mitigations = [
 "/src/doc/nomicon" =                                     ["@ehuss"]
 "/src/doc/reference" =                                   ["@ehuss"]
 "/src/doc/rust-by-example" =                             ["@ehuss"]
-"/src/doc/rustc-dev-guide" =                             ["@kobzol", "@jieyouxu"]
+"/src/doc/rustc-dev-guide" =                             ["compiler"]
 "/src/doc/rustdoc" =                                     ["rustdoc"]
 "/src/doc/style-guide" =                                 ["style-team"]
 "/src/etc" =                                             ["@Mark-Simulacrum"]