Address issue found in src/DescriptionBox.js [Opened by bitHound]

[binhqd]

bitHound discovered 2 LintIssues in src/DescriptionBox.js. For details go to bitHound.

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Solve these issues with Lint:

1. Declare only one React component per file (line 25)
2. 'children' is missing in props validation (line 27)