[skip e2e] Modify code comments according to the naming conventions (#15171)

Signed-off-by: Nguoxiangzhou <xiangzhou.guo@zilliz.com>

internal/proxy/metrics_info.go

@@ -224,7 +224,7 @@ func getSystemInfoMetrics(
 			TargetType:          typeutil.DataCoordRole,
 		})
 
-		// data coord in system topology graph
+		// DataCoord in system topology graph
 		dataCoordTopologyNode := metricsinfo.SystemTopologyNode{
 			Identifier: identifierMap[dataCoordRoleName],
 			Connected:  make([]metricsinfo.ConnectionEdge, 0),