Developer Guide: Missing description related to when events are defined in non-NVDAObjects when additional parameters exist for the event.

[hwf1324]

Is your feature request related to a problem? Please describe.

The developer's guide description is problematic when defining events where additional parameters exist on non-NVDAObjects. For example:

code:

import globalPluginHandler
from NVDAObjects import NVDAObject


class GlobalPlugin(globalPluginHandler.GlobalPlugin):
	def event_mouseMove(self, obj: NVDAObject, nextHandler):
		nextHandler()

log:

WARNING - eventHandler._EventExecuter.next (14:23:30.746) - MainThread (19504):
Could not execute function event_mouseMove defined in globalPlugins.testMouseMove module; kwargs: {'x': 499, 'y': 531}
Traceback (most recent call last):
  File "eventHandler.pyc", line 128, in next
TypeError: GlobalPlugin.event_mouseMove() got an unexpected keyword argument 'x'

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Add a description of this situation to the documentation.

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