docs: fix broken generators.yml in CLI generator quickstart

[devin-ai-integration]

Summary

The generators.yml code block in the CLI generator quickstart had a stray go appended to the generators: key, producing invalid YAML that readers would copy verbatim.

 groups:
   cli:
-    generators:go
+    generators:
       - name: fern-cli-generator

Link to Devin session: https://app.devin.ai/sessions/e9fc68a999ec40c482135d293c719632

[devin-ai-integration]

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[github-actions]

🌿 Preview your docs: https://fern-preview-devin-1784739477-fix-cli-generators-yaml.docs.buildwithfern.com/learn

Here are the markdown pages you've updated:

• learn/cli-generator/get-started/quickstart

[Copilot]

Pull request overview

Fixes an invalid fern/generators.yml example in the CLI generator quickstart by removing a stray go appended to the generators: key, ensuring the snippet is valid YAML that readers can copy.

Changes:

• Corrected generators:go to generators: in the fern/generators.yml code block.
• Restored proper YAML structure for the cli group generator list.

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