Update doc/providers/serializer.rst

fixed links
merged branch jdreesen/patch-2 (PR #599)

This PR was merged into the master branch.

Commits
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61bbc74 Update doc/providers/serializer.rst

Discussion
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Update doc/providers/serializer.rst

fixed links

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by igorw at 2013-01-20T00:48:17Z

:+1: thanks