conf.py: don't include stuff that we import from stdlib in gevent.socket documentation

doc/conf.py

@@ -202,18 +202,15 @@ latex_documents = [
 
 
 # prevent some stuff from showing up in docs
-import gevent.queue
+import socket
 import gevent.http
 import gevent.socket
 del gevent.http.HTTPServer.spawn   # it's a parameter, not a method
 del gevent.Greenlet.throw
-gevent.socket.__all__.remove('error')
-gevent.socket.__all__.remove('gaierror')
-gevent.socket.__all__.remove('timeout')
-try:
-    gevent.socket.__all__.remove('sslerror')
-except:
-    pass
+del gevent.socket.socket.fd
+for item in gevent.socket.__all__[:]:
+    if getattr(gevent.socket, item) is getattr(socket, item):
+        gevent.socket.__all__.remove(item)
 
 
 # order the methods in the class documentation the same way they are ordered in the source code