Fix repeated words in Classes tutorial (GH-21455)
The phrase "At any time during execution," was repeated twice.
Automerge-Triggered-By: @Mariatta
diff --git a/Doc/tutorial/classes.rst b/Doc/tutorial/classes.rst
index 250d2a9..685552f 100644
--- a/Doc/tutorial/classes.rst
+++ b/Doc/tutorial/classes.rst
@@ -114,8 +114,8 @@
name attempts to find the name in the namespace.
Although scopes are determined statically, they are used dynamically. At any
-time during execution, At any time during execution, there are 3 or 4 nested
-scopes whose namespaces are directly accessible:
+time during execution, there are 3 or 4 nested scopes whose namespaces are
+directly accessible:
* the innermost scope, which is searched first, contains the local names
* the scopes of any enclosing functions, which are searched starting with the