Remove the duplicated words (#5251)

Although it is spelling mistakes, it might make an affects while reading.

Co-Authored-By: Nguyen Phuong An <AnNP@vn.fujitsu.com>
Signed-off-by: Kim Bao Long <longkb@vn.fujitsu.com>

docs/configuration/configuration.md

@@ -998,7 +998,7 @@ groups:
 # The port to use for discovery and metric scraping.
 [ port: <int> | default = 9163 ]
 
-# The interval which should should be used for refreshing target containers.
+# The interval which should be used for refreshing target containers.
 [ refresh_interval: <duration> | default = 60s ]
 
 # The Triton discovery API version.

documentation/examples/remote_storage/remote_storage_adapter/influxdb/client.go

@@ -214,7 +214,7 @@ func mergeResult(labelsToSeries map[string]*prompb.TimeSeries, results []influx.
 }
 
 func concatLabels(labels map[string]string) string {
-	// 0xff cannot cannot occur in valid UTF-8 sequences, so use it
+	// 0xff cannot occur in valid UTF-8 sequences, so use it
 	// as a separator here.
 	separator := "\xff"
 	pairs := make([]string, 0, len(labels))