fix(content-docs): give context about sidebar loading failure

[Josh-Cena]

Motivation

Noted on Discord:

[INFO] Starting the development server...
[ERROR] Loading of version failed for version current
[ERROR] ValidationError: {
  "type": "doc",
  "id" [1]: ""
}

We could have added a pointer to the sidebar file.

Have you read the Contributing Guidelines on pull requests?

Yes

[netlify]

✔️ [V2]

🔨 Explore the source changes: 39c953c

🔍 Inspect the deploy log: https://app.netlify.com/sites/docusaurus-2/deploys/62295aa65b46ac0008ec1f97

😎 Browse the preview: https://deploy-preview-6887--docusaurus-2.netlify.app

[github-actions]

⚡️ Lighthouse report for the changes in this PR:

Category	Score
🟠 Performance	59
🟢 Accessibility	100
🟢 Best practices	92
🟢 SEO	100
🟢 PWA	90

Lighthouse ran on https://deploy-preview-6887--docusaurus-2.netlify.app/

[github-actions]

Size Change: 0 B

Total Size: 791 kB

ℹ️ View Unchanged

Filename	Size
website/.docusaurus/globalData.json	49.9 kB
website/build/assets/css/styles.********.css	105 kB
website/build/assets/js/main.********.js	597 kB
website/build/index.html	38.7 kB

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