Backport PR #1192: Prep release notes (#1196)

Co-authored-by: Isaac Virshup <[email protected]>

Author: meeseeksmachine

docs/release-notes/0.10.2.md

@@ -1,4 +1,4 @@
-### 0.10.2 {small}`the future`
+### 0.10.2 {small}`2023-10-11`
 
 ```{rubric} Bugfix
 ```
@@ -10,8 +10,8 @@
 * Fixed extra steps being included in IO tracebacks {pr}`1193` {user}`flying-sheep`
 * `as_dense` argument of `write_h5ad` no longer writes an array without encoding metadata {pr}`1193` {user}`flying-sheep`
 
-```{rubric} Documentation
-```
 
 ```{rubric} Performance
 ```
+
+* Improved performance of `concat_on_disk` with dense arrays in some cases {pr}`1169` {user}`selmanozleyen`