docs(node): improve guidance for pnpm installation with corepack (#3375)

CONTRIBUTING.md

@@ -6,7 +6,7 @@ Thank you for your interest in contributing to Module Federation! Before startin
 
 1. [Fork](https://help.github.com/articles/fork-a-repo/) the Module Federation repository into your own GitHub account.
 2. [Clone](https://help.github.com/articles/cloning-a-repository/) the repository to your local machine.
-3. Checkout a new branch from `main` or `canary`.
+3. Checkout a new branch from `main`.
 4. Set up the development environment. Refer to the "Setup Development Environment" section below for guidance.
 5. If you've fixed a bug or added code that should be tested, add some tests.
 6. Ensure all tests pass. See the "Testing" section below for more information.
@@ -30,7 +30,6 @@ To install Node.js, use [nvm](https://github.com/nvm-sh/nvm) or [fnm](https://gi
 ```bash
 # Install Node.js 18 LTS
 nvm install 18 --lts
-nvm alias default 18
 nvm use 18
 ```
 
@@ -39,6 +38,7 @@ nvm use 18
 ```sh
 # Enable pnpm with corepack, only available on Node.js >= `v14.19.0`
 corepack enable
+corepack install
 ```
 
 Add nx to global