some cleanups needed on readme page

[daaronr]

This package is not yet available from CRAN.

-- is that ever planned?

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comparison_table compares a variable across a group, both visually and with an appropriate statistical test.

'visually makes me think of a graph. I would replace it with 'informally'

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> iris %>% tab(Species, Petal.Width)
> iris %>% tab(Species, Petal.Width)

-- Repeated line

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iris %>% dplyr_table(Petal.Width, Species, percent = TRUE)
> iris %>% tab(Species, Petal.Width, percent = TRUE)

I think the first line is an error?

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fish_for_correlations is not working, so remove from readme?

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Examples
The EA Survey

Its not clear where it surveytools2 is being used in that link