Add changelog for minor versions (#2229)

- v8.8.6
- v8.6.8

---------

Co-authored-by: Abdoulbari Zaher <32519851+a-zakir@users.noreply.github.com>
Co-authored-by: Jason Maréchal <45510813+JasonMarechal25@users.noreply.github.com>

docs/developer-guide/CHANGELOG.md

@@ -83,6 +83,11 @@ toc_depth: 2
 * Fix invalid index causing segfault in `test-study` test (#1902)
 
 ## Branch 8.8.x (end of support 12/2025)
+### 8.8.6 (07/2024)
+#### Bugfix
+- Fix missing synthesis results for links (#2115)
+#### Dependencies
+- Update vcpkg (fix Boost)
 
 ### 8.8.5 (05/2024)
 #### Bugfix
@@ -318,6 +323,12 @@ toc_depth: 2
 * Array, logs jit and correlation in makefile (#1410)
 
 ## Branch 8.6.x (end of support 06/2025)
+### 8.6.8 (07/2024)
+#### Bugfix
+- [UI] Remove propery storagecycle for short term storage added when saving a study (#2037)
+#### Dependencies
+- Update vcpkg (fix Boost)
+
 ### 8.6.7 (05/2024)
 #### Bugfixes
 * Fix formula use in output var Profit by plant [ANT-1719] (https://github.com/AntaresSimulatorTeam/Antares_Simulator/pull/2097)