Add all submodules to the list of directories tidy skips

I ran git config --file .gitmodules --name-only --get-regexp path
and added all submodules that were not already in the list to it.

Author: est31

src/tools/tidy/src/walk.rs

@@ -21,6 +21,12 @@ pub fn filter_dirs(path: &Path) -> bool {
         "src/tools/rust-installer",
         "src/tools/rustfmt",
         "src/doc/book",
+        "src/doc/edition-guide",
+        "src/doc/embedded-book",
+        "src/doc/nomicon",
+        "src/doc/rust-by-example",
+        "src/doc/rustc-dev-guide",
+        "src/doc/reference",
         // Filter RLS output directories
         "target/rls",
         "src/bootstrap/target",