Update csst_ms_mbi_img_L1_fits.md

csst_ms_mbi_img_L1_fits.md

@@ -53,6 +53,7 @@
 | DEC_CEN   | 26.72643742371229         | the center of detector in dec | -99                   | f32  | csst_ms_mbi_distortion  |
 | DIST_V    | '1.0     '                | version of distortion         | '0.0'                 | str  | csst_ms_mbi_distortion  |
 | DIST_TOL  | '2022-12-29T16:36:47'     | distortion operation time     | '2022-12-29T16:36:47' | str  | csst_ms_mbi_distortion  |
+| DIST_S    |                   0       | 0=done 1=wrong                | 1                     | i8   | csst_ms_mbi_distortion  | 
 
 #### Header of `csst_ms_mbi_position`