bpo-41426 Fix grammar in curses.getmouse() documentation (GH-21677)

Automerge-Triggered-By: @brettcannon

Author: s3bw

Doc/library/curses.rst

@@ -214,7 +214,7 @@ The module :mod:`curses` defines the following functions:
 .. function:: getmouse()
 
    After :meth:`~window.getch` returns :const:`KEY_MOUSE` to signal a mouse event, this
-   method should be call to retrieve the queued mouse event, represented as a
+   method should be called to retrieve the queued mouse event, represented as a
    5-tuple ``(id, x, y, z, bstate)``. *id* is an ID value used to distinguish
    multiple devices, and *x*, *y*, *z* are the event's coordinates.  (*z* is
    currently unused.)  *bstate* is an integer value whose bits will be set to