Tweak ‘error’ and ‘user-error’ doc strings
* lisp/net/tramp.el (tramp-user-error): * lisp/subr.el (user-error): Say that user errors are sometimes called pilot errors. * lisp/subr.el (error, user-error): Reorder wording to discuss mechanism first, then formatting advice, rather than going back and forth between the two topics. Tighten up the wording a bit.
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