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tidb: add description for var tidb_ddl_reorg_max_write_speed #19445

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tidb: add description for var tidb_ddl_reorg_max_write_speed #19445

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tidb: add description for var tidb_ddl_reorg_max_write_speed
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Expand Up @@ -1699,6 +1699,16 @@
- This variable is used to set the priority of executing the `ADD INDEX` operation in the `re-organize` phase.
- You can set the value of this variable to `PRIORITY_LOW`, `PRIORITY_NORMAL` or `PRIORITY_HIGH`.

### `tidb_ddl_reorg_max_write_speed` <span class="version-mark">New in v8.5.0</span>
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- Scope: GLOBAL
- Persists to cluster: Yes
- Applies to hint [SET_VAR](/optimizer-hints.md#set_varvar_namevar_value): No
- Type: Integer
- Default value: `0`
- Range: `[0, 1125899906842624]` (i.e. the maximum value that can be set is 1 PiB)

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[PingCAP.Latin] Use 'that is' instead of 'i.e.'.

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{"message": "[PingCAP.Latin] Use 'that is' instead of 'i.e.'.", "location": {"path": "system-variables.md", "range": {"start": {"line": 1709, "column": 35}}}, "severity": "ERROR"}
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- This variable only takes effect when index creation acceleration is enabled (by [`tidb_ddl_enable_fast_reorg`](#tidb_ddl_enable_fast_reorg-new-in-v630)). It limits the bandwidth in which writing data into each TiKV. The default value `0` means no writing limitation. The default unit is bytes per second. You can also set this variable to values like `'1GiB'`, `'256MiB`.
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### tidb_ddl_reorg_worker_cnt

> **Note:**
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