Update file_uploads.rst#3525

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juanmf wants to merge 4 commits intosymfony:2.4from

Commits on Jan 29, 2014

Update file_uploads.rst
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Commits on Feb 4, 2014

Update file_uploads.rst
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Commits on Mar 21, 2014

Rewording Caution paragraph at line 413
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Commits on Mar 24, 2014

Going back to the ``Caution`` alternative.
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