Docs (discuss feedback): fix incorrect statement about upsert blocks allowing one query and one mutation

Per DGRAPH-2777

Author: aaroncarey

README.md

@@ -45,7 +45,7 @@ pip install pydgraph
 
 ### Install Notes
 
-To avoid issues when adding composite credentials or when using client authorization, please install gRPC version 1.19.0: 
+To avoid issues when adding composite credentials or when using client authorization, please install gRPC version 1.19.0:
 
 ```sh
 pip install grpcio==1.19.0
@@ -300,10 +300,12 @@ txn.do_request(request)
 
 ### Running an Upsert: Query + Mutation
 
-The `txn.do_request` function allows you to run upserts consisting of one query and
-one mutation. Query variables could be defined and can then be used in the mutation.
+The `txn.do_request` function allows you to use upsert blocks consisting of one
+query block and one mutation block. Query variables can be defined and can then
+be used in the mutation.
 
-To know more about upsert, we highly recommend going through the [mutations docs](https://docs.dgraph.io/mutations/#upsert-block).
+To learn more about upsert blocks, see the
+[Upsert Block docs](https://dgraph.io/docs/mutations/upsert-block/).
 
 ```python
 query = """{