add(docs): Note default path to config in docs #583

Job	Run time
Generate crates matrix	10s
Check crates matrix	8s
Build zebrad crate	29m 48s
Build zebra-utils crate	16m 58s
Build zebra-test crate	1m 41s
Build zebra-state crate	21m 42s
Build zebra-script crate	4m 39s
Build zebra-scan crate	19m 25s
Build zebra-rpc crate	23m 53s
Build zebra-node-services crate	4m 0s
Build zebra-network crate	7m 4s
Build zebra-consensus crate	18m 20s
Build zebra-chain crate	4m 56s
Build tower-fallback crate	1m 9s
Build tower-batch-control crate	13m 9s
Open or update issues for building crates individually failures	0s
	2h 47m 2s

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