Fix 'package-vc-selected-packages' documentation

* lisp/emacs-lisp/package-vc.el (package-vc-selected-packages): Remove
reference to non-existent function and add an explanation that the
value won't override an existing source package installation.

1 files changed, 6 insertions, 2 deletions

diff --git a/lisp/emacs-lisp/package-vc.el b/lisp/emacs-lisp/package-vc.el
index d6d3f7645e7..1ef7d0d318e 100644
--- a/lisp/emacs-lisp/package-vc.el
+++ b/lisp/emacs-lisp/package-vc.el
@@ -151,8 +151,12 @@ is a symbol designating the package and SPEC is one of:
   specification.
 
 This user option differs from `package-selected-packages' in that
-it is meant to be specified manually.  You can also use the
-function `package-vc-selected-packages' to apply the changes."
+it is meant to be specified manually.  If you want to install all
+the packages in the list, you cal also use
+`package-vc-install-selected-packages'.
+
+Note that this option will not override an existing source
+package installation or revert the checked out revision."
   :type '(alist :tag "List of packages you want to be installed"
                 :key-type (symbol :tag "Package")
                 :value-type