master/5.0: remove low-version descriptions (pingcap#5538)

Liuxiaozhen12 · Apr 29, 2021 · cf712bc · cf712bc
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diff --git a/mysql-compatibility.md b/mysql-compatibility.md
@@ -54,8 +54,6 @@ However, some features of MySQL are not supported. This could be because there i
 
 > **Note:**
 >
-> + To use the `tidb_allow_remove_auto_inc` system variable, your TiDB version must be >= v2.1.18 or >= v3.0.4.
-> + The `AUTO_ID_CACHE` table attribute requires that your TiDB version >= v3.0.14 or >= v3.1.2 or >= v4.0.0-rc.2.
 > + If you have not specified the primary key when creating a table, TiDB uses `_tidb_rowid` to identify the row. The allocation of this value shares an allocator with the auto-increment column (if such a column exists). If you specify an auto-increment column as the primary key, TiDB uses this column to identify the row. In this situation, the following situation might happen:
 
 ```sql

diff --git a/tiflash/maintain-tiflash.md b/tiflash/maintain-tiflash.md
@@ -32,18 +32,6 @@ There are two ways to check the TiFlash version:
 
 ## TiFlash critical logs
 
-Starting from TiDB 4.0.5, TiFlash's log format has been refined for compatibility with TiDB. Therefore, there are two versions of log messages. 
-
-Before TiDB 4.0.5:
-
-| Log Information | Log Description |
-|---------------|-------------------|
-| [ 23 ] `<Information>` KVStore: Start to persist [region 47, applied: term 6 index 10] | Data starts to be replicated (the number in the square brackets at the start of the log refers to the thread ID |
-| [ 30 ] `<Debug>` CoprocessorHandler: grpc::Status DB::CoprocessorHandler::execute() | Handling DAG request, that is, TiFlash starts to handle a Coprocessor request |
-| [ 30 ] `<Debug>` CoprocessorHandler: grpc::Status DB::CoprocessorHandler::execute() | Handling DAG request done, that is, TiFlash finishes handling a Coprocessor request |
-
-After TiDB 4.0.5:
-
 | Log Information | Log Description |
 |---------------|-------------------|
 | [INFO] [`<unknown>`] ["KVStore: Start to persist [region 47, applied: term 6 index 10]"] [thread_id=23] | Data starts to be replicated (the number in the square brackets at the start of the log refers to the thread ID |