Small rmail and rmailmm changes, many doc fixes.
* lisp/mail/rmail.el (rmail-file-coding-system): It's only ever used in a boolean sense, so just make it a boolean, and fix the doc. (rmail-show-mime-function, rmail-mime-feature) (rmail-require-mime-maybe): Doc fixes. (rmail-show-message-1): Check rmail-show-mime-function is non-nil. * lisp/mail/rmailmm.el (rmail-show-mime): Doc fix.
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