Merge pull request #214 from ga4gh-beacon/sabela-issue-213

Add missing clarification (issue #213).

beacon.yaml

@@ -344,7 +344,7 @@ components:
           $ref: '#/components/schemas/Chromosome'
         start:
           description: |
-            Precise start coordinate position, allele locus (0-based).
+            Precise start coordinate position, allele locus (0-based, inclusive).
             * start only:
               - for single positions, e.g. the start of a specified sequence alteration where the size is given through the specified alternateBases
               - typical use are queries for SNV and small InDels
@@ -355,7 +355,7 @@ components:
           format: int64
           minimum: 0
         end:
-          description: Precise end coordinate. See start.
+          description: Precise end coordinate (0-based, exclusive). See start.
           type: integer
         startMin:
           description: |