cdc: add description about support versions for redo log parameters (#…

…20120)

ticdc/ticdc-changefeed-config.md

@@ -392,13 +392,13 @@ Note: The consistency-related configuration items only take effect when the down
 - The number of flushing workers in the redo module.
 - Default value: `8`
 
-#### `compression`
+#### `compression` <span class="version-mark">New in v6.5.6, v7.1.3, v7.5.1, and v7.6.0</span>
 
 - The behavior to compress redo log files.
 - Default value: `""`, which means no compression
 - Value options: `""`, `"lz4"`
 
-#### `flush-concurrency`
+#### `flush-concurrency` <span class="version-mark">New in v6.5.6, v7.1.3, v7.5.1, and v7.6.0</span>
 
 - The concurrency for uploading a single redo file.
 - Default value: `1`, which means concurrency is disabled