chore: remove repetitive words (#581)

Signed-off-by: divdeploy <chenguangxue@outlook.com>

backend/telemetry_core/tests/e2e_tests.rs

@@ -463,7 +463,7 @@ async fn e2e_feed_add_and_remove_shard() {
             }))
             .unwrap();
 
-        // Keep what we need to to keep connection alive and let us kill a shard:
+        // Keep what we need to keep connection alive and let us kill a shard:
         shards.push((shard_id, node_tx));
     }
 

backend/test_utils/src/server/server.rs

@@ -84,7 +84,7 @@ pub enum ServerMode {
         shards: DenseMap<ProcessId, ShardProcess>,
     },
     ConnectToExistingMode {
-        /// The hosts that we can connect to to submit things.
+        /// The hosts that we can connect to submit things.
         submit_hosts: Vec<String>,
         /// Which host do we use next (we'll cycle around them
         /// as shards are "added").