[DOC] Add changelog for branch 8.8.x (#2441)

docs/developer-guide/CHANGELOG.md

@@ -89,6 +89,24 @@ toc_depth: 2
 * Fix invalid index causing segfault in `test-study` test (#1902)
 
 ## Branch 8.8.x (end of support 12/2025)
+### 8.8.10 (09/2024)
+
+#### Bugfix (adequacy patch)
+* Force enable-first-step=false [ANT-2218] (#2419)
+* Adequacy patch CSR - revamp output variables [ANT-1932] (#2421)
+* Place CSR after hydro remix [ANT-2070] (#2407)
+
+#### Bugfix (other)
+* Use OR-Tools v9.11-rte1.1 [ANT-2069] (#2418)
+
+## 8.8.9 (09/2024)
+* Revert "Fix bug hydro heuristic with mingen (ANT-1825) (#2258)"
+
+## 8.8.8 (09/2024)
+#### Bugfix
+* Timeseries generation stored in input (#2180)
+* Fix bug hydro heuristic with mingen (ANT-1825) (#2258)
+
 ### 8.8.7 (07/2024)
 #### Improvements
 - Add OR-Tools solver option for batchrun tool (#1981)