walletrpc: document that min conf_target is 2

[starius]

Change Description

Without this notice a developer might think that 1 is a valid value, which can result in a rare bug.

Example: lightninglabs/loop#898

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[yyforyongyu]

I don't think this is correct? I think all implementations allow a conf target of 1, this is also used in the sweeper.

For web API,

lnd/lnwallet/chainfee/estimator.go

Lines 804 to 809 in de1ed93

	if numBlocks > MaxBlockTarget {
	numBlocks = MaxBlockTarget
	} else if numBlocks < minBlockTarget {
	return 0, fmt.Errorf("conf target of %v is too low, minimum "+
	"accepted is %v", numBlocks, minBlockTarget)
	}

For bitcoind it's allowed, not sure the RPC resp returned from btcd tho.

What error did you get?

[lightninglabs-deploy]

@starius, remember to re-request review from reviewers when ready