Fix idlelib typos discovered by min ho, pr 15018. (GH-15029)

diff --git a/Lib/idlelib/pyparse.py b/Lib/idlelib/pyparse.py
index 81e7f53..feb57cb 100644
--- a/Lib/idlelib/pyparse.py
+++ b/Lib/idlelib/pyparse.py
@@ -575,7 +575,7 @@
         return code[i:j]
 
     def is_block_opener(self):
-        "Return True if the last interesting statemtent opens a block."
+        "Return True if the last interesting statement opens a block."
         self._study2()
         return self.lastch == ':'