DOC: Clarify method in docstring

IPython/terminal/pt_inputhooks/wx.py

@@ -155,7 +155,9 b' def inputhook_wxphoenix(context):'
     """Run the wx event loop until the user provides more input.
 
     This function uses the same approach to that used in
-    ipykernel.eventloops.loop_wx.
+    ipykernel.eventloops.loop_wx. The wx.MainLoop is executed, and a wx.Timer
+    is used to periodically poll the context for input. As soon as input is
+    ready, the wx.MainLoop is stopped.
     """
 
     app = wx.GetApp()