Update docs

Author: jason-fox

doc/advanced-topics.md

@@ -58,7 +58,6 @@ values. If the latitude and longitude are received as separate measures, the
     "entity_type": "GPS",
     "resource":    "/iot/d",
     "protocol":    "PDI-IoTA-JSON",
-    "autocastGeoJSON" : "Point,LineString,Polygon"
 ..etc
     "attributes": [
         {
@@ -81,7 +80,7 @@ the following formats:
   "name": "location",
   "value": "23, 12.5"
 }
-````
+```
 
 -   an array of numbers
 
@@ -104,12 +103,18 @@ the following formats:
 }
 ```
 
-Because GeoJSON types (e.g. `Point`, `LineString` etc.) are native types in NGSI-LD, automatic GeoJSON convertion is switched on for NGSI-LD by default.
+Because GeoJSON types (e.g. `Point`, `LineString` etc.) are native types in **NGSI-LD**, automatic GeoJSON convertion is switched on for NGSI-LD by default.
 
-With NGSI-v2, for backwards compatibility reasons, automatic GeoJSON conversion for types other than `geo:json` is turned off by default.
+With **NGSI-v2**, for backwards compatibility reasons, automatic GeoJSON conversion for types other than `geo:json` is turned off by default.
 Add the `config.autocastGeoJSON` configuration to enable GeoJSON conversion
 and supply a comma delimited list of additional types to convert.
 
+```json
+{
+  "autocastGeoJSON" : "Point,LineString,Polygon"
+}
+```
+
 ### Metadata support
 
 Both `attributes` and `static_attributes` may be supplied with metadata when provisioning an IoT Agent, so that the
@@ -157,7 +162,7 @@ following:
 -   Temporal Properties (e.g. `Datetime`, `Date` , `Time`)
 -   GeoJSON types (e.g `Point`, `LineString`, `Polygon`, `MultiPoint`, `MultiLineString`, `MultiPolygon`)
 
-Most NGSI-LD attributes are sent to the Context Broker as _properties_. If a GeoJSON type or native JSON type is
+Most **NGSI-LD** attributes are sent to the Context Broker as _properties_. If a GeoJSON type or native JSON type is
 defined, the data will be converted to the appropriate type. Temporal properties should always be expressed in UTC,
 using ISO 8601. This ISO 8601 conversion is applied automatically for the `observedAt` _property-of-a-property_ metadata
 where present.