docs: restore an anchor to for/else (GH-126154)

(cherry picked from commit 2d9d101)

Co-authored-by: Ned Batchelder <[email protected]>

Author: nedbat

Doc/tutorial/controlflow.rst

@@ -196,6 +196,7 @@ iteration of the loop::
     Found an odd number 9
 
 .. _tut-for-else:
+.. _break-and-continue-statements-and-else-clauses-on-loops:
 
 :keyword:`!else` Clauses on Loops
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