resource_control: remove unnecessary comment (#8026)

ref #4399

Signed-off-by: Cabinfever_B <[email protected]>

pkg/mcs/resourcemanager/server/config.go

@@ -123,7 +123,6 @@ func (rmc *ControllerConfig) Adjust(meta *configutil.ConfigMetaData) {
 
 // RequestUnitConfig is the configuration of the request units, which determines the coefficients of
 // the RRU and WRU cost. This configuration should be modified carefully.
-// TODO: use common config with client size.
 type RequestUnitConfig struct {
 	// ReadBaseCost is the base cost for a read request. No matter how many bytes read/written or
 	// the CPU times taken for a request, this cost is inevitable.