Test

docs: clarify the feature flag #1066

Job	Run time
cli-test	16m 49s
check	2m 25s
test	9m 51s
e2e-example-test (basic, core)	7m 20s
e2e-example-test (capsules, core)	9m 52s
e2e-example-test (custom_server, core)	5m 33s
e2e-example-test (error_views, core)	7m 36s
e2e-example-test (freezing_and_thawing, core)	8m 11s
e2e-example-test (global_state, core)	7m 26s
e2e-example-test (helper_build_state, core)	7m 42s
e2e-example-test (i18n, core)	7m 46s
e2e-example-test (idb_freezing, core)	7m 17s
e2e-example-test (index_view, core)	7m 50s
e2e-example-test (js_interop, core)	8m 23s
e2e-example-test (plugins, core)	8m 4s
e2e-example-test (preload, core)	9m 6s
e2e-example-test (router_state, core)	6m 32s
e2e-example-test (rx_state, core)	7m 31s
e2e-example-test (set_headers, core)	7m 10s
e2e-example-test (state_generation, core)	10m 18s
e2e-example-test (static_content, core)	7m 53s
e2e-example-test (suspense, core)	5m 50s
e2e-example-test (unreactive, core)	6m 21s
	3h 2m 46s

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