Fixed typo in KS pseudo-spectral

Author: GodotMisogi

benchmarks/SimpleHandwrittenPDE/ks_spectral_wpd.jmd

@@ -70,7 +70,7 @@ xs, prob = kuramoto_sivashinsky(N, L, alpha)
 
 sol = solve(prob, Rodas5(autodiff=false); dt = 1e-4, reltol = 1e-12, abstol = 1e-12)
 
-test_sol = TestSolution(sol) # Reference soluton for error estimation
+test_sol = TestSolution(sol) # Reference solution for error estimation
 
 tslices = LinRange(prob.tspan..., 50)
 ys = mapreduce(sol, hcat, tslices)