config: Remove obsolete items from the config template file.
## Whether to enable request batch.
# enable-request-batch = true
-## Whether to collect batch across commands.
-## When disabled, wait duration is ignored. When enabled, collect batch for specified duration
-## when load is high.
-# request-batch-enable-cross-command = true
-
-## Wait duration before each request batch is processed. Wait is triggered when cross-command
-## option is enabled and system load is high.
-# request-batch-wait-duration = "1ms"
-
## Attributes about this server, e.g. `{ zone = "us-west-1", disk = "ssd" }`.
# labels = {}
# sst-max-size = "144MB"
[pessimistic-txn]
-## Enable pessimistic transaction
-# enabled = true
-
## The default and maximum delay before responding to TiDB when pessimistic
## transactions encounter locks
# wait-for-lock-timeout = "1s"
