docs: fix site adapter matcher API name

[16Miku]

Summary

• update site-adapter examples from match to the implemented matches property
• align getActiveAdapter() snippets with the production call to a.matches(url)
• keep the English, Chinese, and French adapter guides consistent

Why

The current implementation calls a.matches(url). Copying the documented match examples creates an adapter that never activates.

Testing

• git diff --check
• verified the four updated guides contain no stale match: (url) or a.match(url) examples
• npm test: 1352 passed, 2 unrelated existing failures (CHANGELOG.md version lags package.json; promotion recommendation locale expectation)

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