Fix a typo in the Programming FAQ. (#3230)

subobjects, not subobjecs.

Doc/faq/programming.rst

@@ -1638,7 +1638,7 @@ collected.
 
 Despite the cycle collector, it's still a good idea to define an explicit
 ``close()`` method on objects to be called whenever you're done with them.  The
-``close()`` method can then remove attributes that refer to subobjecs.  Don't
+``close()`` method can then remove attributes that refer to subobjects.  Don't
 call :meth:`__del__` directly -- :meth:`__del__` should call ``close()`` and
 ``close()`` should make sure that it can be called more than once for the same
 object.