Add some documentation on defining new generalized variables

* doc/lispref/variables.texi (Setting Generalized Variables):
Split most of previous contents into this subsection.
(Adding Generalized Variables): New subsection.

* doc/lispref/elisp.texi:
Add Generalized Variables subsections to detailed menu.

* etc/NEWS: Mention some gv.el macros by name.

1 files changed, 2 insertions, 0 deletions

diff --git a/etc/NEWS b/etc/NEWS
index 4f8b56cb363..c9c68513a8b 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -783,6 +783,8 @@ systems), or based on memory allocations.
 
 ** CL-style generalized variables are now in core Elisp.
 `setf' is autoloaded; `push' and `pop' accept generalized variables.
+You can define your own generalized variables using `gv-define-simple-setter',
+`gv-define-setter', etc.
 
 +++
 ** `defun' also accepts a (declare DECLS) form, like `defmacro'.