fix: normalized RainFallRadarObserved example

Fixed some issues related to GeoJSON and
DateTime properties in the normalized
NGSI-LD example file.

Issue: #29

Author: rokf

RainFallRadarObserved/examples/example-normalized.jsonld

@@ -24,22 +24,22 @@
     "dateObserved": {
         "type": "Property",
         "value": {
-            "type": "DateTime",
-            "value": "2020-03-17T08:30:00Z"
+            "@type": "DateTime",
+            "@value": "2020-03-17T08:30:00Z"
         }
     },
     "dateObservedFrom": {
         "type": "Property",
         "value": {
-            "type": "DateTime",
-            "value": "2020-03-17T08:30:00Z"
+            "@type": "DateTime",
+            "@value": "2020-03-17T08:30:00Z"
         }
     },
     "dateObservedTo": {
         "type": "Property",
         "value": {
-            "type": "DateTime",
-            "value": "2020-03-17T08:45:00Z"
+            "@type": "DateTime",
+            "@value": "2020-03-17T08:45:00Z"
         }
     },
     "description": {
@@ -49,7 +49,7 @@
     "location": {
         "type": "GeoProperty",
         "value": {
-            "type": "polygon",
+            "type": "Polygon",
             "coordinates": [
                 [
                     [
@@ -109,4 +109,4 @@
 
         "https://raw.githubusercontent.com/smart-data-models/dataModel.Environment/master/context.jsonld"
     ]
-}
+}