Moved a copy memoryview example to the examples directory.

docs/examples/userguide/memoryviews/copy.pyx

+import numpy as np
+
+cdef int[:, :, :] to_view, from_view
+to_view = np.empty((20, 15, 30), dtype=np.intc)
+from_view = np.ones((20, 15, 30), dtype=np.intc)
+
+# copy the elements in from_view to to_view
+to_view[...] = from_view
+# or
+to_view[:] = from_view
+# or
+to_view[:, :, :] = from_view

docs/src/userguide/memoryviews.rst

@@ -125,17 +125,9 @@ means you get consecutive slices for every unspecified dimension::
 Copying
 -------
 
-Memory views can be copied in place::
+Memory views can be copied in place:
 
-    cdef int[:, :, :] to_view, from_view
-    ...
-
-    # copy the elements in from_view to to_view
-    to_view[...] = from_view
-    # or
-    to_view[:] = from_view
-    # or
-    to_view[:, :, :] = from_view
+.. literalinclude:: ../../examples/userguide/memoryviews/copy.pyx
 
 They can also be copied with the ``copy()`` and ``copy_fortran()`` methods; see
 :ref:`view_copy_c_fortran`.