Hi, while being bitten by <a href="http://bugs.gentoo.org/show_bug.cgi?id=5816>Bug #5816</a> I took at closer look at the emacs ebuild script, that is app-editors/emacs/emacs-21.2-r1.ebuild. Line #68 of that script does a "cd" which confuses the dodoc on line #80. The result is that no documentation is installed in /usr/share/doc. Inserting the line "dodoc BUGS ChangeLog README" just before line #68, should fix this.
i think this is fixed now. please re-open if it is not.