update release notes

Author: Christopher Doris

docs/src/releasenotes.md

@@ -2,8 +2,10 @@
 
 ## Unreleased
 * Minimum supported Python version is now 3.10.
+* Minimum supported Julia version is now 1.10.
 * Showing `Py` now respects the `compact` option - output is limited to a single line of
   at most the display width.
+* Support policy now documented in the FAQ.
 * Bug fixes.
 
 ## 0.9.28 (2025-09-17)