Update peps/pep-0849.rst

fix spelling

Co-authored-by: Jelle Zijlstra <jelle.zijlstra@gmail.com>

Author: ImogenBits

peps/pep-0849.rst

@@ -532,7 +532,7 @@ Acknowledgements
 
 Thanks to Michael J. Sullivan for a lot of helpful feedback on this PEP and the
 reference implementation. Particularly, the idea to replace annotate functions
-with ``AnnotateObject``, which lead to a significant performance improvement.
+with ``AnnotateObject``, which led to a significant performance improvement.
 
 
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