Update dsma661.md to add dropdown menu

Author: Bot-Enigma-0

_vandv/dsma661.md

@@ -1,6 +1,6 @@
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 title: 2D DSMA661 Airfoil Near-Wake RANS Verification Case
-permalink: /vandv/DSMA661/
+permalink: /vandv/dsma661/
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 | Solver | Version |
@@ -238,4 +238,4 @@ Additional codes have been compared against the FUN3D and CFL3D results, and are
 <p align="center">
 <img src="/vandv_files/dsma661/images/sst/comp_skinfric_coeff.png" alt="Airfoil Surface Skin Friction Coefficient on Finest Grid">
 </p>
-**Figure (46)**: Airfoil Surface Skin Friction Coefficient on Finest Grid
+**Figure (46)**: Airfoil Surface Skin Friction Coefficient on Finest Grid