correct the typos (#4950)

diff --git a/Modules/_cursesmodule.c b/Modules/_cursesmodule.c
index 42f4a85..7936aef 100644
--- a/Modules/_cursesmodule.c
+++ b/Modules/_cursesmodule.c
@@ -1363,7 +1363,7 @@
         use_xy = TRUE;
         break;
     default:
-        PyErr_SetString(PyExc_TypeError, "insch requires 1 or 4 arguments");
+        PyErr_SetString(PyExc_TypeError, "insch requires 1 to 4 arguments");
         return NULL;
     }
 
@@ -1394,7 +1394,7 @@
         rtn = mvwinch(self->win,y,x);
         break;
     default:
-        PyErr_SetString(PyExc_TypeError, "inch requires 0 or 2 arguments");
+        PyErr_SetString(PyExc_TypeError, "inch requires 0 to 2 arguments");
         return NULL;
     }
     return PyLong_FromUnsignedLong(rtn);