Update bake help file

[topepo]

See the review of the blog post

We should update the description of the composition argument to bake() and remove or alter the line that

Note that all computations during the baking process are done in a non-sparse format

Looking at hardhat::recompose(), it does not appear that we need another value for that argument.

[EmilHvitfeldt]

Note that all computations during the baking process are done in a non-sparse format

I assume non-sparse format refers to a sparse matrix, as it can be a tibble/data.frame with sparse vectors

[github-actions]

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