Fix typo in package-alist docstring
Pointed out by Michael Heerdegen <michael_heerdegen@web.de>. * lisp/emacs-lisp/package.el (package-alist): Fix docstring grammar (bug#17403).
Pointed out by Michael Heerdegen <michael_heerdegen@web.de>. * lisp/emacs-lisp/package.el (package-alist): Fix docstring grammar (bug#17403).