changelog: add missing utop releases (#3249)

Author: sabine

data/changelog/releases/utop/2025-01-10-utop-2.15.0.md

@@ -0,0 +1,17 @@
+---
+title: Utop 2.15.0
+tags:
+- utop
+- platform
+authors:
+- Octachron
+contributors:
+changelog:
+versions:
+unstable: false
+ignore: false
+github_release_tags:
+- 2.15.0
+---
+
+We're happy to announce Utop 2.15.0 which adds support for OCaml 5.3.0!

data/changelog/releases/utop/2025-07-25-utop-2.16.0.md

@@ -0,0 +1,25 @@
+---
+title: Utop 2.16.0
+tags:
+- utop
+- platform
+authors:
+- Octachron
+contributors:
+changelog: |
+    *   Add support for OCaml 5.4 ([#500](https://github.com/ocaml-community/utop/pull/500), [@Octachron](https://github.com/Octachron), [@anmonteiro](https://github.com/anmonteiro))
+    *   restore backtrace ([#503](https://github.com/ocaml-community/utop/pull/503), fixes [#501](https://github.com/ocaml-community/utop/issues/501), [@ysalmon](https://github.com/ysalmon))
+    *   support camlp$n preprocessor ([#486](https://github.com/ocaml-community/utop/pull/486), fixes [#485](https://github.com/ocaml-community/utop/issues/485), [@aqjune](https://github.com/aqjune))
+    *   utop configuration and state files (utoprc, utop-history) are now always in the relevant  utop subdirectory ([#484](https://github.com/ocaml-community/utop/pull/484), fixes [#478](https://github.com/ocaml-community/utop/issues/478), [#481](https://github.com/ocaml-community/utop/issues/481) and [#499](https://github.com/ocaml-community/utop/issues/499), [@tuohy](https://github.com/tuohy)).
+    *   fix emacs completion for qualified paths (`Module.M.some\_name`) ([#497](https://github.com/ocaml-community/utop/pull/497), fix [#455](https://github.com/ocaml-community/utop/issues/455), [@juergenhoetzel](https://github.com/juergenhoetzel), [@bbatsov](https://github.com/bbatsov))
+    *   implicit bindings for emacs mode ([#465](https://github.com/ocaml-community/utop/pull/465), fix [#412](https://github.com/ocaml-community/utop/issues/412), [@bencef](https://github.com/bencef))
+versions:
+unstable: false
+ignore: false
+github_release_tags:
+- 2.16.0
+---
+
+We're happy to announce the release of Utop 2.16.0!
+
+This utop release adds OCaml 5.4 support, restores backtrace functionality, improves preprocessor and Emacs integration, and relocates configuration files to a dedicated utop subdirectory.