Improve documentation and UI of 'C-x v L'
* lisp/vc/vc.el (vc-print-root-log): Improve the wording of the doc string and of the prompt for the root directory. * etc/NEWS: Improve and expand the wording of the changes in 'C-x v L'. * doc/emacs/maintaining.texi (VC Change Log): Improve and clarify wording of the 'C-x v L' description.
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