Some small changes: - Add link to "Use Cases" in EXPLAINER.md - Adjus…

…t the order of paragraphs to make them unified - Remove "Examples" chapter temporarily: there are two examples, one is moved to the corresponding chapter, the other one was removed due to duplication. Maybe we can add the actual use cases based on this API in the future. - Fix some errors.

SHA: 86b110d
Reason: push, by backkem

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