Align comments in example code snippets.

[yifanyang]

No description provided.

[changeset-bot]

⚠️ No Changeset found

Latest commit: 576059e

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

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[google-oss-bot]

Binary Size Report

Affected SDKs

No changes between base commit (40a702e) and head commit (465659a).

Test Logs

• Base (40a702eb): https://github.com/firebase/firebase-js-sdk/actions/runs/549677278
• Head (465659a5): https://github.com/firebase/firebase-js-sdk/actions/runs/550285612

[google-oss-bot]

Size Analysis Report

Affected Products

No changes between base commit (40a702e) and head commit (465659a).

Test Logs

• Base (40a702e): https://github.com/firebase/firebase-js-sdk/actions/runs/549677278
• Head (465659a): https://github.com/firebase/firebase-js-sdk/actions/runs/550285612

[hsubox76]

Thanks!