Add changelog for the latest merlin releases (#2580)

data/changelog/merlin/2024-06-12-merlin-4.16.md

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+---
+title: Merlin 4.16 for OCaml 4.14 and 5.1
+tags: [merlin, platform]
+changelog: |
+  + merlin binary
+    - Addition of a `merlin-lib.commands` library which disassociates the
+      execution of commands from the `new_protocol`, from the binary, allowing
+      it to be invoked from other projects (ocaml/merlin#1758)
+    - `merlin-lib.commands`: Add a `find_command_opt` alternative to
+      `find_command` that does not raise (ocaml/merlin#1778)
+
+---
+
+We are pleased to announce the release of Merlin `4.16-414` and `4.16-501`.
+
+These releases expose additional functions for packages using merlin-lib that
+need to manually parse merlin commands.

data/changelog/merlin/2024-06-24-merlin-5.1.md

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+---
+title: Merlin 5.1-502 for OCaml 5.2
+tags: [merlin, platform]
+changelog: |
+  + merlin binary
+    - Support project-wide occurrences queries using index files (ocaml/merlin#1766)
+      - The file format is described in library `Merlin_lib.index_format`
+      - Two new configuration directives are introduced:
+        - `SOURCE_ROOT` that is used to resolve relative paths found in the
+          indexes.
+        - `INDEX` that is used to declare the list of index files Merlin should
+          use when looking for occurrences.
+    - A new `UNIT_NAME` configuration directive that can be used to tell Merlin
+      the correct name of the current unit in the presence of wrapping (ocaml/merlin#1776)
+    - Perform incremental indexation of the buffer when typing. (ocaml/merlin#1777)
+    - `merlin-lib.commands`: Add a `find_command_opt` alternative to
+      `find_command` that does not raise (ocaml/merlin#1778)
+    - Prevent uid clashes by not returning PWO for defs located in the current
+      interface file (ocaml/merlin#1781)
+    - Reset uid counters when restoring the typer cache so that uids are stable
+      across re-typing (ocaml/merlin#1779)
+    - Improve the behavior on occurrences when the cursor is on a label /
+      constructor declaration (ocaml/merlin#1785)
+  + editor modes
+    - emacs: add basic support for project-wide occurrences (ocaml/merlin#1766)
+    - vim: add basic support for project-wide occurrences (ocaml/merlin#1767, @Julow)
+
+---
+
+We are pleased to announce the release of Merlin `5.1-502`. This is an important release that brings a lot of backend changes and a major
+new feature: project-wide occurrences queries.
+
+Try it by running `dune build @ocaml-index` (since dune `3.16.0`) and performing a reference query!
+
+More information can be found in the [discuss
+announcement](https://discuss.ocaml.org/t/ann-project-wide-occurrences-in-merlin-and-lsp/14847)
+and the
+[wiki](https://github.com/ocaml/merlin/wiki/Get-project%E2%80%90wide-occurrences).