Add documentation for @next releases to Contributing.md

Contributing.md

@@ -45,7 +45,7 @@ The slate repository is a monorepo that is managed with [lerna](https://github.c
 
 To run the build, you need to have the Slate repository cloned to your computer. After that, you need to `cd` into the directory where you cloned it, and install the dependencies with `yarn` and build the monorepo:
 
-```
+```shell
 yarn install
 yarn build
 ```
@@ -56,7 +56,7 @@ To run the examples, start by building the monorepo as described in the [Reposit
 
 Then you can start the examples server with:
 
-```
+```shell
 yarn start
 ```
 
@@ -66,7 +66,7 @@ To run the tests, start by building the monorepo as described in the [Repository
 
 Then you can rerun the tests with:
 
-```
+```shell
 yarn test
 ```
 
@@ -82,8 +82,20 @@ If you only want to run a specific test or tests, you can run `yarn test --fgrep
 
 Since we use [Lerna](https://lerna.js.org) to manage the Slate packages this is fairly easy, just run:
 
-```js
+```shell
-yarn release
+yarn release:latest
 ```
 
 And follow the prompts Lerna gives you.
+
+If we are unsure as to the stability of a release because there are significant changes and/or particularly complex changes, release with the `@next` tag.
+
+```shell
+yarn release:next
+```
+
+If we want to make sure that Slate code follows the prerequisites for a release but without actually publishing, run:
+
+```shell
+yarn prerelease
+```