IDLE: Fix 2 typos found by Min ho Kim. (GH-15617)

diff --git a/Lib/idlelib/browser.py b/Lib/idlelib/browser.py
index e5b0bc5..3c3a53a 100644
--- a/Lib/idlelib/browser.py
+++ b/Lib/idlelib/browser.py
@@ -29,7 +29,7 @@
     The dictionary maps names to pyclbr information objects.
     Filter out imported objects.
     Augment class names with bases.
-    The insertion order of the dictonary is assumed to have been in line
+    The insertion order of the dictionary is assumed to have been in line
     number order, so sorting is not necessary.
 
     The current tree only calls this once per child_dict as it saves