Add new hook to augment help buffers.
* help-fns.el (help-fns-describe-function-functions): New variable to call functions for augmenting help buffers. (describe-function-1): Remove explicit calls to `help-fns--compiler-macro', `help-fns--parent-mode' and `help-fns--obsolete'. Put them in above new variable instead. Call all of them through `run-hook-with-args'.
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