Explain delayed pane content cleanup

scripts/restore.sh

@@ -372,6 +372,8 @@ restore_active_and_alternate_sessions() {
 	done < $(last_resurrect_file)
 }
 
+# A cleanup that happens after 'restore_all_panes' seems to fix fish shell
+# users' restore problems.
 cleanup_restored_pane_contents() {
 	if is_restoring_pane_contents; then
 		rm "$(pane_contents_dir "restore")"/*