hydra-examples.el (hydra-rectangle): Change "p" to "x"

hydra-examples.el

@@ -270,7 +270,7 @@ _v_ariable       _u_ser-option
 _h_   _l_   _o_k        _y_ank
   ^_j_^     _n_ew-copy  _r_eset
 ^^^^        _e_xchange  _u_ndo
-^^^^        ^ ^         _p_aste
+^^^^        ^ ^         _x_kill
 "
   ("h" rectangle-backward-char nil)
   ("l" rectangle-forward-char nil)
@@ -285,7 +285,7 @@ _h_   _l_   _o_k        _y_ank
   ("y" yank-rectangle nil)
   ("u" undo nil)
   ("s" string-rectangle nil)
-  ("p" kill-rectangle nil)
+  ("x" kill-rectangle nil)
   ("o" nil nil))
 
 ;; Recommended binding: