Fix repeated words in Classes tutorial (GH-21455)

The phrase "At any time during execution," was repeated twice.

Automerge-Triggered-By: @Mariatta
(cherry picked from commit 4f28f75dee)

Co-authored-by: Paul McMillan <paul@mcmillan.ws>
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Miss Islington (bot) 2020-07-13 18:49:56 -07:00 committed by GitHub
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@ -114,8 +114,8 @@ accessible. "Directly accessible" here means that an unqualified reference to a
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