Window(fix[swap]): refresh self and target after swap-window

why: swap-window swaps window object pointers at tmux indices, changing
     window_index on both objects. Not refreshing leaves stale state,
     identical to the issue fixed in move_window by commit 3654a36.
what:
- Add self.refresh() after successful swap-window cmd
- Refresh target Window if target is a Window instance
- Remove manual refresh() calls from docstring examples (now automatic)

Author: tony

src/libtmux/window.py

@@ -808,8 +808,6 @@ def swap(
         >>> w1_idx = w1.window_index
         >>> w2_idx = w2.window_index
         >>> w1.swap(w2)
-        >>> w1.refresh()
-        >>> w2.refresh()
         >>> w1.window_index == w2_idx
         True
         >>> w2.window_index == w1_idx
@@ -828,6 +826,10 @@ def swap(
         if proc.stderr:
             raise exc.LibTmuxException(proc.stderr)
 
+        self.refresh()
+        if isinstance(target, Window):
+            target.refresh()
+
     def rename_window(self, new_name: str) -> Window:
         """Rename window.