fix(doc): Fix outdated Dockerfile features comment #147

Job	Run time
Build CI Docker / Build images	11m 35s
Test with fake activation heights	13m 37s
Test all	7m 45s
Test integration with lightwalletd	18m 56s
Test checkpoint sync from empty state	19m 38s
Test CI default Docker config file / Test default-conf in Docker	2m 43s
Test CI testnet Docker config file / Test testnet-conf in Docker	2m 42s
Test CI custom Docker config file / Test custom-conf in Docker	1m 43s
Open or update issues for main branch failures	0s
	1h 18m 39s

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