[w3c/ServiceWorker] A description mistake in spec document (#1391)

in [4.7. Events](https://w3c.github.io/ServiceWorker/#execution-context-events) section. 

> The service worker's containing service worker registration’s installing worker changes. (See step 11.2 of the Install algorithm.)

**…… (See step 11.2 of the Install algorithm.)** should be not ~11.2~ but **10.2**.

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