Fix "Download serialization" in the documentation
In the documentation, in the section "Download serialization", the second "N-Triples" should be removed since it is duplicated and the link goes to the n3 file (also already shown).
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In the documentation, in the section "Download serialization", the second "N-Triples" should be removed since it is duplicated and the link goes to the n3 file (also already shown).