Clarify test description

[sthodup1]

Pre-Submission Checklist

• Your pull request targets the staging branch of FreeCodeCamp.
• Branch starts with either fix/, feature/, or translate/ (e.g. fix/signin-issue)
• You have only one commit (if not, squash them into one commit).
• All new and existing tests pass the command npm run test-challenges. Use git commit --amend to amend any fixes.

Type of Change

• Small bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds new functionality)
• Breaking change (fix or feature that would change existing functionality)
• Add new translation (feature adding new translations)

Checklist:

• Tested changes locally.
• Closes currently open issue (replace XXXX with an issue no): Closes #XXXX

Description

Clarifies that else and if statements should not be anywhere in the editor for the Replacing If Else Chains with Switch challenge.

[camperbot]

@sthodup1 thanks for the PR.
This PR is opened against master branch and will be closed.
Your branch name should start with one of fix/, feature/, translate/ prefixes. Name, your branches correctly next time, please.
Please, review our Guidelines for Contributing, thank you!.