Correct some spelling errors.

core/src/toga/widgets/optioncontainer.py

@@ -96,7 +96,7 @@ def remove(self, index: int | str | OptionItem):
         self.interface.refresh()
 
     def __iter__(self):
-        """Obtain an interator over all tabs in the OptionContainer."""
+        """Obtain an iterator over all tabs in the OptionContainer."""
         return iter(self._options)
 
     def __len__(self) -> int:

core/tests/test_handlers.py

@@ -102,7 +102,7 @@ def handler(*args, **kwargs):
 
 
 def test_function_handler_with_cleanup_error(capsys):
-    """A function handler can have a cleanup method that raises an erro"""
+    """A function handler can have a cleanup method that raises an error."""
     obj = Mock()
     cleanup = Mock(side_effect=Exception("Problem in cleanup"))
     handler_call = {}

core/tests/widgets/test_optioncontainer.py

@@ -446,7 +446,7 @@ def test_current_tab(optioncontainer, index, on_select_handler):
     assert optioncontainer.current_tab.index == 0
     assert optioncontainer.current_tab.text == "Item 1"
 
-    # Programatically select item 2
+    # Programmatically select item 2
     optioncontainer.current_tab = index
 
     # Current tab values have changed

testbed/tests/widgets/test_optioncontainer.py

@@ -79,14 +79,15 @@ async def test_select_tab(
 ):
     """Tabs of content can be selected"""
     # Initially selected tab has content that is the full size of the widget
+    await probe.redraw("Tab 1 should be selected")
     assert widget.current_tab.index == 0
     assert content1_probe.width > 500
     assert content1_probe.height > 400
 
     # on_select hasn't been invoked.
     on_select_handler.assert_not_called()
 
-    # Select item 1 programatically
+    # Select item 1 programmatically
     widget.current_tab = "Tab 2"
     await probe.redraw("Tab 2 should be selected")