Another update to skipWating recipe

[jeffposnick]

R: @philipwalton

Fixes GoogleChrome/workbox#2430

We'll need to update this again in v6 to use the new messageSkipWaiting() method, but this should hopefully be sufficient for v4/v5 users.

[WebFundBot]

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WARNINGS
src/content/en/tools/workbox/guides/advanced-recipes.md#L21 - '<script> tags are generally not allowed, please double check.
src/content/en/tools/workbox/guides/advanced-recipes.md#L368 - Consider adding a "was this page helpful?" widget to your page: https://developers.google.com/web/resources/widgets#helpful
src/content/en/tools/workbox/guides/advanced-recipes.md#L96 - Common typo found: 'javascript' Should it be 'JavaScript'?
src/content/en/tools/workbox/guides/advanced-recipes.md#L114 - Common typo found: 'javascript' Should it be 'JavaScript'?
src/content/en/tools/workbox/guides/advanced-recipes.md#L141 - Common typo found: 'javascript' Should it be 'JavaScript'?
src/content/en/tools/workbox/guides/advanced-recipes.md#L187 - Common typo found: 'javascript' Should it be 'JavaScript'?
src/content/en/tools/workbox/guides/advanced-recipes.md#L258 - Common typo found: 'javascript' Should it be 'JavaScript'?
src/content/en/tools/workbox/guides/advanced-recipes.md#L284 - Common typo found: 'javascript' Should it be 'JavaScript'?
src/content/en/tools/workbox/guides/advanced-recipes.md#L345 - Common typo found: 'javascript' Should it be 'JavaScript'?
src/content/en/tools/workbox/guides/advanced-recipes.md#L184 - Line must be at most 100 characters