Update resize doc (#1022)

* docs: more comments added for resize method

* docs: minor grammar fix

Co-authored-by: Hailiang Zhang <[email protected]>

Author: hailiangzhang

zarr/core.py

@@ -2406,6 +2406,10 @@ def resize(self, *args):
 
         If one or more dimensions are shrunk, any chunks falling outside the
         new array shape will be deleted from the underlying store.
+        However, it is noteworthy that the chunks partially falling inside the new array
+        (i.e. boundary chunks) will remain intact, and therefore,
+        the data falling outside the new array but inside the boundary chunks
+        would be restored by a subsequent resize operation that grows the array size.
 
         """