Fix syntax error in demo

Author: kchristin22

_gsocblogs/2024/blog_CUDA_kernels_autodiff.md

@@ -404,15 +404,15 @@ int main() {
     const size_type D1 = 2, D2 = 3, D3 = 4, D4 = 3, D5 = 2;
 
     float A[D1][D2][D3] = {
-        {{1, 2, 3, 4}, {5, 6, 7, 8}, {9, 10, 11, 12}},
-        {{13, 14, 15, 16}, {17, 18, 19, 20}, {21, 22, 23, 24}}
+        { {1, 2, 3, 4}, {5, 6, 7, 8}, {9, 10, 11, 12} },
+        { {13, 14, 15, 16}, {17, 18, 19, 20}, {21, 22, 23, 24} }
     };
 
     float B[D3][D4][D5] = {
-        {{1, 2}, {3, 4}, {5, 6}},
-        {{7, 8}, {9, 10}, {11, 12}},
-        {{13, 14}, {15, 16}, {17, 18}},
-        {{19, 20}, {21, 22}, {23, 24}}
+        { {1, 2}, {3, 4}, {5, 6} },
+        { {7, 8}, {9, 10}, {11, 12} },
+        { {13, 14}, {15, 16}, {17, 18} },
+        { {19, 20}, {21, 22}, {23, 24} }
     };
 
     float C[D1][D2][D4][D5] = {0};  // Result tensor