Commit 3b448298 authored by Eli Zaretskii's avatar Eli Zaretskii

Update and improve documentation of project.el commands

* doc/emacs/custom.texi (Prefix Keymaps): Document
* doc/emacs/maintaining.texi (Project File Commands)
(Switching Projects): Describe key bindings for the commands
described in the sections.  Document 'project-list-file'.
(Project Buffer Commands): New section.
* doc/emacs/emacs.texi (Top): Add Project sections to the detailed

* etc/NEWS: Add entries for project.el, and mark documented entries as
parent eaad6eac
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