docs: fix up bridge-react loading example

[gioboa]

Description

Fix bridge-react loading example.
Source types in repo require loading to be a node, not a component type.

Related Issue

Close #4599

Types of changes

• Docs change / refactoring / dependency upgrade
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)

Checklist

• I have added tests to cover my changes.
• All new and existing tests passed.
• I have updated the documentation.

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