Update release instructions; Changes.md -> CHANGELOG.md (#5652)

Author: cknitt

.prettierignore

@@ -6,6 +6,6 @@ ninja/
 syntax/
 ocaml-tree/
 _opam
-Changes.md
+CHANGELOG.md
 README.md
 playground/

CONTRIBUTING.md

@@ -392,8 +392,8 @@ To build a new version and release it on NPM, follow these steps:
 
 1. Increment the version number in `package.json`.
 1. Run `node scripts/setVersion.js` to take that version number over into other files.
-1. Snapshot (run ninja build to regenerate `whole_compiler.ml` etc.).
-1. Update `Changes.md`.
+1. Snapshot (run `make` to regenerate `whole_compiler.ml` etc.).
+1. Update `CHANGELOG.md`.
 1. Create a PR.
 1. Once that PR is merged, download the `npm-packages.zip` artifact for that commit from the Github Actions page.
 1. Extract `npm-packages.zip` to get the package tarballs to publish.
@@ -410,7 +410,7 @@ To build a new version and release it on NPM, follow these steps:
    npm publish rescript-std-<version>.tgz [--tag next]
    ```
 1. Tag the commit with the version number (e.g., "10.0.0", or "10.0.0-beta.1") and push the tag.
-1. Create a release entry for that tag on the [Github Releases page](https://github.com/rescript-lang/rescript-compiler/releases), copying the changes from `Changes.md`.
+1. Create a release entry for that tag on the [Github Releases page](https://github.com/rescript-lang/rescript-compiler/releases), copying the changes from `CHANGELOG.md`.
 1. Coordinate any forum/blog posts with [@ryyppy](https://github.com/ryyppy).
 
 ## Contribution Licensing