Revised documentation for plan_fft #148
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This PR revises the docstring for plan_fft.
My main impetus was to add a warning about serializing/sharing plans. Due to the name, I naively had assumed that "plans" were simply descriptive ("use this algorithm") and could be shared across processes (e.g., via @Everywhere). This seems to be a relatively common mistake, so I thought it was worth a warning.
I also did some light copy-editing and reformatting while adding that, which I think makes the text clearer.