Update doc/api.md

doc/api.md

@@ -153,7 +153,7 @@ parameters defined at device level in database, the parameters are inherit from
 ## Special measures and attributes names
 
 In case of arriving measures with name `id` or `type`, they are automatically transformed to `measure_id` and 
-`measure_type` attributes at Context Broker update. The reason behind this is to avoid to collide with the original entity id and type, as mechanism 
+`measure_type` attributes at Context Broker update. The reason behind this is to avoid to collide with the original entity ID and type, as mechanism 
 that enable store measure values from parameters called with the same name. It only applies to autoprovisioned
 attributes and is also available at JEXL context with the same name (`measure_id`or `measure_type`).