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DOC: Futher warning that indicator lengths can affect results

Refs: d7eaa45 Fixes #1184

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Original file line number	Diff line number	Diff line change
`@@ -119,6 +119,13 @@ def I(self, # noqa: E743`
`119`	`119`
`120`	`120`	`def init():`
`121`	`121`	`self.sma = self.I(ta.SMA, self.data.Close, self.n_sma)`
	`122`	`+`
	`123`	`+ .. warning::`
	`124`	`+ Rolling indicators may front-pad warm-up values with NaNs.`
	`125`	`+ In this case, the **backtest will only begin on the first bar when`
	`126`	`+ all declared indicators have non-NaN values** (e.g. bar 201 for a`
	`127`	`+ strategy that uses a 200-bar MA).`
	`128`	`+ This can affect results.`
`122`	`129`	`"""`
`123`	`130`	`def _format_name(name: str) -> str:`
`124`	`131`	`return name.format(*map(_as_str, args),`

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