Update docs/details/other-components/observer.rst

Co-authored-by: André Costa <[email protected]>

docs/details/other-components/observer.rst

@@ -227,7 +227,7 @@ Subject and deleted from the LVGL heap.  Note this is different from
 
     lv_observer_t * observer = lv_subject_add_observer_obj(&some_subject, some_observer_cb, widget, user_data);
 
-Like the above, once a Widget is thus assocated with an Observer, a pointer to the
+Like the above, once a Widget is thus associated with an Observer, a pointer to the
 Widget can be retrieved by calling :cpp:expr:`lv_observer_get_target(observer)`, e.g.
 inside the callback function.