Fix table formatting in sample.md

Author: PrabhjotSingh247

sbn/sbnprod_wiki/sample.md

@@ -67,8 +67,8 @@ Monte Carlo official SBN Production Samples
 | Sample Description | production push | release version | # Events | SAM Database |
 | --- | --- | --- | --- | --- |
 | BNB + Cosmics - gen1 | SBND2026A | v10_06_00_09 | ~200k | SBND only |
-| reco1 | mc_SBND2026A_gen1_prodgenie_corsika_proton_rockbox_sbnd_GIBUU_CV_v10_06_00_09_reco1_sbnd |
-| flatcaf | mc_SBND2026A_gen1_prodgenie_corsika_proton_rockbox_sbnd_GIBUU_CV_v10_06_00_09_flatcaf_sbnd |
+| reco1 | mc_SBND2026A_gen1_prodgenie_corsika_proton_rockbox_sbnd_GIBUU_CV_v10_06_00_09_reco1_sbnd | | | |
+| flatcaf | mc_SBND2026A_gen1_prodgenie_corsika_proton_rockbox_sbnd_GIBUU_CV_v10_06_00_09_flatcaf_sbnd | | | |
 
 #### Fall Production 2025 (gen2) - Syst Variations
 | Sample Description | production push | release version | # Events | SAM Database |