RUST-2187 Test stable API on sharded clusters (#1425)

Author: abr-egn

.evergreen/config.yml

@@ -199,8 +199,9 @@ buildvariants:
       # Configuring SSL: ssl causes errors in bootstrap mongo-orchestration.
     tasks:
       # The Stable API was introduced in MongoDB version 5.0. Drivers Evergreen Tools only supports
-      # setting REQUIRE_API_VERSION on standalones.
+      # setting REQUIRE_API_VERSION on standalones and sharded clusters.
       - .standalone !.4.0 !.4.2 !.4.4
+      - .sharded !.4.0 !.4.2 !.4.4
 
   - name: sync-api
     display_name: "Sync API"

src/test/documentation_examples.rs

@@ -1684,16 +1684,9 @@ async fn convenient_transaction_examples() -> Result<()> {
         return Ok(());
     }
 
-    let uri = DEFAULT_URI.clone();
+    let client = Client::for_test().await;
     // Start Transactions withTxn API Example 1
 
-    // For a replica set, include the replica set name and a seedlist of the members in the URI
-    // string; e.g. let uri = "mongodb://mongodb0.example.com:27017,mongodb1.example.com:27017/?
-    // replicaSet=myRepl"; For a sharded cluster, connect to the mongos instances; e.g.
-    // let uri = "mongodb://mongos0.example.com:27017,mongos1.example.com:27017/";
-
-    let client = Client::with_uri_str(uri).await?;
-
     // Prereq: Create collections. CRUD operations in transactions must be on existing collections.
 
     client