DOC: lua: add sticktable class reference from Proxy.stktable

Add a reference hint for the sticktable class and mention it from
Proxy.stktable documentation to allow easy navigation from a web
browser.

diff --git a/doc/lua-api/index.rst b/doc/lua-api/index.rst
index 5716312..eadf2f2 100644 (file)
--- a/doc/lua-api/index.rst
+++ b/doc/lua-api/index.rst
@@ -1087,7 +1087,8 @@ Proxy class
 
 .. js:attribute:: Proxy.stktable
 
-  Contains a stick table object attached to the proxy.
+  Contains a stick table object of type :ref:`sticktable_class` attached to the
+  proxy.
 
 .. js:attribute:: Proxy.listeners
 
@@ -3730,6 +3731,8 @@ AppletTCP class
   :see: :js:func:`AppletTCP.unset_var`
   :see: :js:func:`AppletTCP.set_var`
 
+.. _sticktable_class:
+
 StickTable class
 ================