documentation for filter-out

[Raphael Payen]

In the documentation :
http://www.gnu.org/manual/make/html_chapter/make_8.html#SEC77

$(filter-out pattern...,text) 
Returns all whitespace-separated words in text that do not match any of the
pattern words, removing the words that do match one or more. This is the
exact opposite of the filter function. Removes all whitespace-separated
words in text that do match the pattern words, returning only the words that
do not match. This is the exact opposite of the filter function. For
example, given [...]

I think there is too much text.

Thank you for all your work.
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Payen Raphael
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