Fix broken link in binary-deployment.md (#437)

Caused by a capitalization mismatch

Author: ryanpbrewster

op-guide/binary-deployment.md

@@ -323,7 +323,7 @@ Follow the steps below to start PD, TiKV, and TiDB:
 > **Note**:
 >
 > - If you start TiKV or deploy PD in the production environment, it is highly recommended to specify the path for the configuration file using the `--config` parameter. If the parameter is not set, TiKV or PD does not read the configuration file.
-> - To tune TiKV, see [Performance Tuning for TiKV](./tune-TiKV.md).
+> - To tune TiKV, see [Performance Tuning for TiKV](./tune-tikv.md).
 > - If you use `nohup` to start the cluster in the production environment, write the startup commands in a script and then run the script. If not, the `nohup` process might abort because it receives exceptions when the Shell command exits. For more information, see [The TiDB/TiKV/PD process aborts unexpectedly](../trouble-shooting.md#the-tidbtikvpd-process-aborts-unexpectedly).
 
 ## TiDB monitor and alarm deployment