lint-docs: add future edition group

This should have been included in rust-lang#137606.

Author: davidtwco

src/tools/lint-docs/src/groups.rs

@@ -17,6 +17,10 @@ static GROUP_DESCRIPTIONS: &[(&str, &str)] = &[
     ("rust-2018-compatibility", "Lints used to transition code from the 2015 edition to 2018"),
     ("rust-2021-compatibility", "Lints used to transition code from the 2018 edition to 2021"),
     ("rust-2024-compatibility", "Lints used to transition code from the 2021 edition to 2024"),
+    (
+        "edition-future-compatibility",
+        "Lints used to transition code from the 2024 edition to the future edition",
+    ),
     (
         "refining-impl-trait",
         "Detects refinement of `impl Trait` return types by trait implementations",