Update VOCABULARY.md table headers

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clairblacketer 2017-06-14 13:56:34 -04:00
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@ -28,7 +28,7 @@ Field|Required|Type|Description
* Each Vocabulary has an entry in the CONCEPT table, which is recorded in the vocabulary_concept_id field. This is for purposes of creating a closed Information Model, where all entities in the OMOP CDM are covered by a unique Concept.
* In past versions of the VOCABULARY table, the vocabulary_id used to be a numerical value. A conversion table between these old and new IDs is given below:
vocabulary_id previously|vocabulary_id Version 5
Previous VOCABULARY_ID|Version 5 VOCABULARY_ID
-----|-----
|0|None|
|1|[SNOMED](http://www.ohdsi.org/web/wiki/doku.php?id=documentation:vocabulary:snomed)|