[docs] Suggestion on docs for webbrowser

[Christian Clauss]

On http://docs.python.org/library/webbrowser.html

There is the text:
The script webbrowser can be used as a command-line interface for the module. It accepts an URL as the argument. It accepts the following optional parameters: -n opens the URL in a new browser window, if possible; -t opens the URL in a new browser page (“tab”). The options are, naturally, mutually exclusive. 

It might be helpful to readers if you could add some sample syntax such as: $ python -m webbrowser -t "http://www.python.org"
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