add some possible values to the documentation for dht_bootstrap_nodes #3018

Job	Run time
Simulations	16m 46s
Build (asio-debugging=on picker-debugging=on windows-version=vista)	10m 37s
MingW (address-model=64)	13m 16s
Build (windows-api=store windows-version=win10)	5m 58s
Test (address-model=32 crypto=built-in)	12m 19s
Test (address-model=64)	13m 16s
Build (deprecated-functions=off)	9m 48s
Test (release)	16m 17s
	1h 38m 17s

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