Update RELEASES.md

Author: cedricvincentcuaz

RELEASES.md

@@ -13,6 +13,7 @@
 - Fixed numerical errors in `ot.gmm` (PR #690, Issue #689)
 - Add version number to the documentation (PR #696)
 - Update doc for default regularization in `ot.unbalanced` sinkhorn solvers (Issue #691, PR #700)
+- Clean documentation for `gromov`, `lp` and `unbalanced` folders (PR #710)
 
 ## 0.9.5