docs(filter/number): Change description of returned value

[calamarico]

I think this is not correct because since 1.3.0-RC.0 sonic-boltification this change: 2ae10f6 and null and undefined are passing through

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[calamarico]

I signed it!

2015-05-28 14:35 GMT+02:00 googlebot [email protected]:

Thanks for your pull request. It looks like this may be your first
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#11963 (comment).

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CLAs look good, thanks!