Updated DRUG_EXPOSURE (markdown)

StandardizedClinicalDataTables/DRUG_EXPOSURE.md

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 The drug exposure domain captures records about the utilization of a Drug when ingested or otherwise introduced into the body. A Drug is a biochemical substance formulated in such a way that when administered to a Person it will exert a certain physiological effect. Drugs include prescription and over-the-counter medicines, vaccines, and large-molecule biologic therapies. Radiological devices ingested or applied locally do not count as Drugs.
 
 Drug Exposure is inferred from clinical events associated with orders, prescriptions written, pharmacy dispensings, procedural administrations, and other patient-reported information, for example:
+
   * The “Prescription” section of an EHR captures prescriptions written by physicians or from electronic ordering systems
   * The "Medication list" section of an EHR for both non-prescription products and medications prescribed by other providers
   * Prescriptions filled at dispensing providers such as pharmacies, and then captured in reimbursement claim systems
   * Drugs administered as part of a Procedure, such as chemotherapy or vaccines.
 
 Field|Required|Type|Description
-:----|:----|:-----|:-----
+:---------------------------|:--------|:-----|:------------------------------------------------
 |drug_exposure_id|Yes|integer|A system-generated unique identifier for each Drug utilization event.|
 |person_id|Yes|integer|A foreign key identifier to the person who is subjected to the Drug. The demographic details of that person are stored in the person table.|
 |drug_concept_id|Yes|integer|A foreign key that refers to a Standard Concept identifier in the Standardized Vocabularies for the Drug concept.|