Polish the doc

Signed-off-by: JaySon-Huang <[email protected]>

Author: JaySon-Huang

tiflash/troubleshoot-tiflash.md

@@ -153,7 +153,7 @@ If TiFlash replicas consistently fail to be created since the TiDB cluster is de
     - If `true` is returned, go to the next step.
     - If `false` is returned, [enable the Placement Rules feature](/configure-placement-rules.md#enable-placement-rules) and go to the next step.
 
-2. Check whether the TiFlash process is working correctly by viewing `UpTime` on the TiFlash-Summary monitoring panel.
+2. Check whether the TiFlash process is working normally by the `UpTime` on the TiFlash-Summary monitoring panel.
 
 3. Check whether the connection between TiFlash and PD is normal through `pd-ctl`.
 
@@ -170,7 +170,7 @@ If TiFlash replicas consistently fail to be created since the TiDB cluster is de
     ```
 
     - If the value of `count` does not exceed the number of TiKV nodes in the cluster, go to the next step.
-    - If the value of `count` is greater than the number of TiKV nodes in the cluster, the PD does not replicate data to the TiFlash node. To address this issue, change `count` to an integer fewer than or equal to the number of TiKV nodes in the cluster.
+    - If the value of `count` is greater than the number of TiKV nodes in the cluster. For example, if there are only 1 TiKV nodes in a testing cluster while the count is 3, then PD will not add any Region peer to the TiFlash node. To address this issue, change `count` to an integer fewer than or equal to the number of TiKV nodes in the cluster.
 
     > **Note:**
     >