Adding missing descriptions

Author: agbeltran

molecular_entity_schema.json

@@ -132,6 +132,7 @@
                   }
                 },
                 "publications": {
+                  "description": "The list of publications providing evidence of the relationship.",
                   "type": "array",
                   "items": {
                     "$ref": "publication_schema.json#"

place_schema.json

@@ -73,6 +73,7 @@
       "enum": [ "Point", "MultiPoint", "LineString", "MultiLineString", "Polygon", "MultiPolygon", "GeometryCollection"]
     },
     "coordinates": {
+      "description": "A non-empty list of GeoJSON positions.",
       "type": "array",
       "minItems": 1,
       "items": { "$ref": "#/definitions/position" }