Update system-variables.md

pingcap · May 9, 2022 · d2a004a · d2a004a
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@@ -1551,7 +1551,6 @@ SET tidb_query_log_max_len = 20
 ### tidb_restricted_read_only <span class="version-mark">New in v5.2.0</span>
 
 - Scope: GLOBAL
-- Default value: `0`
 - Default value: `OFF`
 - This variable controls the read-only status of the entire cluster. When the variable is `ON`, all TiDB servers in the entire cluster are in the read-only mode. In this case, TiDB only executes the statements that do not modify data, such as `SELECT`, `USE`, and `SHOW`. For other statements such as `INSERT` and `UPDATE`, TiDB rejects executing those statements in the read-only mode.
 - Enabling the read-only mode using this variable only ensures that the entire cluster finally enters the read-only status. If you have changed the value of this variable in a TiDB cluster but the change has not yet propagated to other TiDB servers, the un-updated TiDB servers are still **not** in the read-only mode.