update gevent.core.rst

doc/gevent.core.rst

-:mod:`gevent.core` - Low-level wrappers around libevent
-=======================================================
+:mod:`gevent.core` - event loop based on libev
+==============================================
 
 .. automodule:: gevent.core
 
 events
 ------
 
-.. autoclass:: event(evtype, handle, callback[, arg])
-    :members:
-    :undoc-members:
-.. autoclass:: read_event
-    :members:
-    :undoc-members:
-.. autoclass:: write_event
-    :members:
-    :undoc-members:
-.. autoclass:: timer
-    :members:
-    :undoc-members:
-.. autoclass:: signal
-    :members:
-    :undoc-members:
-.. autoclass:: active_event
+.. autoclass:: loop(flags=None, default=True)
     :members:
     :undoc-members:
 
-event loop
-----------
 
-.. autofunction:: init
-.. autofunction:: dispatch
-.. autofunction:: loop
+misc functions
+--------------
+
 .. autofunction:: get_version
-.. autofunction:: get_method
 .. autofunction:: get_header_version
-
-
-evdns
------
-
-.. autofunction:: dns_init
-.. autofunction:: dns_shutdown
-.. autofunction:: dns_resolve_ipv4
-.. autofunction:: dns_resolve_ipv6
-.. autofunction:: dns_resolve_reverse
-.. autofunction:: dns_resolve_reverse_ipv6
-
-
-evbuffer
---------
-
-.. autoclass:: buffer
-    :members:
-    :undoc-members:
-
-
-evhttp
-------
-
-.. autoclass:: http_request
-    :members:
-    :undoc-members:
-.. autoclass:: http_connection
-    :members:
-    :undoc-members:
-.. autoclass:: http
-    :members:
-    :undoc-members:
+.. autofunction:: supported_backends
+.. autofunction:: recommended_backends
+.. autofunction:: embeddable_backends
+.. autofunction:: time