Added examples on data retrieval

draft-ietf-core-coap-pubsub.md

@@ -130,7 +130,7 @@ Topic resource interactions are discovery, create, read configuration, update co
 Topic data interactions are publish, subscribe, unsubscribe, read and are oriented on how data is transferred from a publisher to a subscriber.
 
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-Throughout the document there is a number of TBDs that need updating, mostly content formats or cbor data representations 
+Throughout the document there is a number of TBDs that need updating, mostly content formats or cbor data representations
 -->
 
 ## Managing Topics {#managing-topics}