BackgroundWorker: More docs #1218

Job	Run time
windows	14m 22s
android	27m 44s
docs	41s
ios	18m 10s
flash-samples	37s
linux	14m 38s
macos	17m 14s
air-samples (4.0.5)	3m 2s
html5-samples	1m 18s
air-samples (4.1.5)	2m 58s
air-samples (4.2.5)	2m 40s
air-samples (4.3.1)	3m 34s
package-haxelib	3m 3s
hashlink-samples (windows-latest)	2m 15s
neko-samples (3.4.7, windows-latest)	2m 15s
hashlink-samples (ubuntu-20.04)	1m 15s
hashlinkc-samples (windows-latest)	3m 9s
neko-samples (3.4.7, ubuntu-20.04)	39s
hashlink-samples (macos-12)	1m 12s
hashlinkc-samples (ubuntu-20.04)	2m 2s
neko-samples (3.4.7, macos-12)	1m 59s
hashlinkc-samples (macos-12)	3m 23s
neko-samples (4.2.5, windows-latest)	2m 41s
neko-samples (4.2.5, ubuntu-20.04)	41s
neko-samples (4.2.5, macos-12)	1m 29s
notify	3s
	2h 13m 4s

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