Align etcd-snapshot-dir default path description #1867

Job	Run time
Build Go Tests	44s
build / Build	7m 33s
E2E Tests (autoimport)	6m 21s
Docker Tests In GO (basics)	1m 12s
E2E Tests (startup)	12m 15s
Docker Tests (basics)	1m 7s
Docker Tests In GO (bootstraptoken)	59s
E2E Tests (s3)	8m 14s
Docker Tests (bootstraptoken)	41s
Docker Tests In GO (cacerts)	58s
E2E Tests (btrfs)	5m 43s
Docker Tests (cacerts)	45s
Docker Tests In GO (etcd)	1m 51s
E2E Tests (externalip)	4m 26s
Docker Tests (compat)	1m 29s
Docker Tests In GO (lazypull)	1m 3s
Docker Tests (lazypull)	59s
E2E Tests (privateregistry)	5m 13s
Docker Tests In GO (skew)	9s
Docker Tests (upgrade)	2m 29s
E2E Tests (embeddedmirror)	5m 2s
Docker Tests In GO (upgrade)	1m 28s
E2E Tests (wasm)	5m 47s
	1h 16m 28s

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