Engine docs for h2o

[qiushiyan]

No description provided.

[simonpcouch]

You may want to add "agua" to this vector:

parsnip/R/engine_docs.R

Lines 50 to 53 in 78e8e16

	extensions <- function() {
	c("baguette", "censored", "discrim", "multilevelmod", "plsmod",
	"poissonreg", "rules", "bonsai")
	}

and re-document so that parsnip knows where the h2o support lives and can document it in models.tsv. :)

[qiushiyan]

Max added agua to extensions in 1b3da01. I have updated inst/models.tsv as well, thanks.

[topepo]

Looks great. One suggestion below.

In the aqua PR, I mentioned making an engine for poisson_reg() so make sure to add that file here too.

[github-actions]

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