Fix `nvm` setup instructions by adding code snippet under Homebrew instructions for M1 Macs.
Related Linear issue with full context [[ https://linear.app/comm/issue/ENG-930/fix-nvm-setup-instructions-on-dev-environment-setup | here ]].
The current code snippet on the dev environment setup is
```
export NVM_DIR="$HOME/.nvm"
[ -s "/usr/local/opt/nvm/nvm.sh" ] && . "/usr/local/opt/nvm/nvm.sh" --no-use # This loads nvm
[ -s "/usr/local/opt/nvm/etc/bash_completion.d/nvm" ] && . "/usr/local/opt/nvm/etc/bash_completion.d/nvm" # This loads nvm bash_completion
```
This code snippet is only printed by Homebrew on Intel Macs, the updated snippet on an M1 Mac looks like:
{F46810}
Updated the docs to acknowledge the differing outputs based on the user's processor, would love to hear feedback regarding the exact verbiage and wording.