Update the documentation to better explain that `shell-integration-fe…

…atures`

src/config/Config.zig

@@ -1639,7 +1639,11 @@ keybind: Keybinds = .{},
 /// The default value is `detect`.
 @"shell-integration": ShellIntegration = .detect,
 
-/// Shell integration features to enable if shell integration itself is enabled.
+/// Shell integration features to configure. These features control both
+/// automatic shell integration (when enabled) and environment variables.
+/// The environment variables are always set unless explicitly disabled with
+/// `shell-integration-features = false`.
+///
 /// The format of this is a list of features to enable separated by commas. If
 /// you prefix a feature with `no-` then it is disabled. If you omit a feature,
 /// its default value is used, so you must explicitly disable features you don't