Update data_model.md

docs/source/sls/data_model.md

@@ -68,9 +68,6 @@ COMMENT ==================================================================
 | SNRMAX    | 1.2      | Maxmum signal to noise of good pixels   | -9999          | float  | C7  |
 | SNRMEAN   | 3.38     | Average of the dark values subtracted   | -9999          | float  | C7   |
 | CRCOUNT  | 88988 | Cosmic ray counts | -9999 | float | C7 |
-VER_INST 仪器改正版本号 
-STA_INST 仪器改正状态
-STM_INST 仪器改正时间戳
 
 #### Header of `csst_ms_sls_position`