Update installation.md

[tylercaceres]

standardize the code block appearance

🎯 Changes

• documentation

✅ Checklist

• I have followed the steps listed in the Contributing guide.
• I have tested and linted this code locally.
• I have generated a changeset for this PR, or this PR should not release a new version.

[changeset-bot]

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Latest commit: 2658430

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