Apply suggestions from code review

Co-Authored-By: kennytm <kennytm@gmail.com>
pingcap · May 8, 2019 · 9b465f2 · lonng · May 8, 2019 · kennytm
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diff --git a/tools/lightning/deployment.md b/tools/lightning/deployment.md
@@ -238,7 +238,7 @@ Download the TiDB-Lightning package (choose the same version as that of the TiDB
     # Maximum number of open engines.
     max-open-engines = 8
     # Maximum upload speed (bytes per second) from Importer to TiKV.
-    upload-speed-limit = "512MB"
+    #upload-speed-limit = "512MB"
     # minimum ratio of target store available space: store_available_space / store_capacity.
     # Importer pauses uploading SST if the availability ratio of the target store is less than this
     # value, to give PD enough time to balance regions.

diff --git a/tools/lightning/errors.md b/tools/lightning/errors.md
@@ -77,9 +77,9 @@ See the [Checkpoints control](../../tools/lightning/checkpoints.md#checkpoints-c
 
     Max Memory Usage ≈ `max-open-engine` × `write-buffer-size` × `max-write-buffer-number`
 
-2. Decrease the value of `table-concurrency` + `index-concurrency` so it is less than `max-open-engine`.
+2. Decrease the value of `table-concurrency` + `index-concurrency` so it is less than `max-open-engines`.
 
-3. Restart `tikv-importer` to forcefully remove all engine files. This also removes all partially imported tables, thus it is required to clear the outdated checkpoints.
+3. Restart `tikv-importer` to forcefully remove all engine files (default to `./data.import/`). This also removes all partially imported tables, thus it is required to clear the outdated checkpoints.
 
     ```sh
     tidb-lightning-ctl --config conf/tidb-lightning.toml --checkpoint-error-destroy=all