docs(graphql): fix wording and grammar error

Co-authored-by: Jay McDoniel <[email protected]>

Author: UtopiaBeam

content/graphql/federation.md

@@ -749,7 +749,7 @@ In the following sections, we'll upgrade the previous example to Federation 2.
 
 #### Federated example: Users
 
-One change in Federation 2 is that entities has no originating subgraph, so we don't need to extend `Query` anymore. For more detail please refer to [this topic](https://www.apollographql.com/docs/federation/federation-2/new-in-federation-2#entities) in Apollo docs.
+One change in Federation 2 is that entities have no originating subgraph, so we don't need to extend `Query` anymore. For more detail please refer to [the entities topic](https://www.apollographql.com/docs/federation/federation-2/new-in-federation-2#entities) in Apollo Federation 2 docs.
 
 #### Schema first