review-classifier: say the 25-line context shows a gate only when it's within 25 lines

swarm-controller/src/forge/pull_diff.rs

@@ -1,8 +1,8 @@
 //! The diff the review classifier reads, built from both sides of each
 //! changed file rather than taken from the forge's `.diff`, whose context is
-//! fixed at 3 lines. With [`CONTEXT_LINES`] of context a moved block keeps
-//! its enclosing gate (a `config = lib.mkIf …`, an option's `default`) in
-//! view, so a move that restates that gate does not read as adding one.
+//! fixed at 3 lines. [`CONTEXT_LINES`] of context shows an enclosing gate (a
+//! `config = lib.mkIf …`, an option's `default`) only when it is within that
+//! many lines of the change; a gate further away is still out of view.
 
 use std::fmt::{self, Write as _};