DOC: lua/event: add ServerEvent class header
This is to make ServerEvent class easier to understand,
some additional info related to ServerEvent class may be
included here.
diff --git a/doc/lua-api/index.rst b/doc/lua-api/index.rst
index f75c6b3..d470491 100644
--- a/doc/lua-api/index.rst
+++ b/doc/lua-api/index.rst
@@ -1487,6 +1487,12 @@
ServerEvent class
=================
+.. js:class:: ServerEvent
+
+This class is provided with every **SERVER** events.
+
+See :js:func:`core.event_sub()` for more info.
+
.. js:attribute:: ServerEvent.name
Contains the name of the server.