Remove a duplicated Changelog section (#1047)

Looks like it was added accidentally in https://github.com/aip-dev/google.aip.dev/pull/977/files

Co-authored-by: Noah Dietz <noahdietz@users.noreply.github.com>

Author: x746e

aip/general/0133.md

@@ -205,10 +205,6 @@ NOT_FOUND errors][permission-denied].
 
 ## Changelog
 
-- **2022-11-04**: Aggregated error guidance to AIP-193.
-
-## Changelog
-
 - **2022-11-04**: Referencing aggregated error guidance in AIP-193, similar to other CRUDL AIPs.
 - **2022-06-02**: Changed suffix descriptions to eliminate superfluous "-".
 - **2020-10-06**: Added declarative-friendly guidance.