[docs][typo] Update fe_config.md (#7252)

Int type should be 4 bytes and decimal should be 16 bytes

docs/en/administrator-guide/config/fe_config.md

@@ -1554,7 +1554,7 @@ MasterOnly：true
 Maximal memory layout length of a row. default is 100 KB. In BE, the maximal size of a RowBlock is 100MB(Configure as max_unpacked_row_block_size in be.conf). And each RowBlock contains 1024 rows. So the maximal size of a row is approximately 100 KB.
      eg.
      schema: k1(int), v1(decimal), v2(varchar(2000))
-     then the memory layout length of a row is: 8(int) + 40(decimal) + 2000(varchar) = 2048 (Bytes)
+     then the memory layout length of a row is: 4(int) + 16(decimal) + 2000(varchar) = 2020 (Bytes)
      See memory layout length of all types, run 'help create table' in mysql-client.
      If you want to increase this number to support more columns in a row, you also need to increase the
      max_unpacked_row_block_size in be.conf. But the performance impact is unknown.

docs/zh-CN/administrator-guide/config/fe_config.md

@@ -1566,7 +1566,7 @@ NORMAL 优先级挂起加载作业的并发数。
 
 例如。
       schema：k1(int), v1(decimal), v2(varchar(2000))
-      那么一行的内存布局长度为：8(int) + 40(decimal) + 2000(varchar) = 2048 (Bytes)
+      那么一行的内存布局长度为：4(int) + 16(decimal) + 2000(varchar) = 2020 (Bytes)
 
 查看所有类型的内存布局长度，在 mysql-client 中运行 `help create table`。