normalization in energy() docstring

Author: navidcy

src/barotropicqg.jl

@@ -331,7 +331,7 @@ set_U!(prob, U::Float64) = set_U!(prob.sol, prob.vars, prob.params, prob.grid, U
     energy(prob)
     energy(sol, grid)
 
-Returns the domain-averaged kinetic energy of solution `sol`: ∫ ½ (u²+v²) dxdy / (Lx Ly) = ∑ ½ k² |ψ̂|².
+Returns the domain-averaged kinetic energy of solution `sol`: ∫ ½ (u²+v²) dxdy / (Lx Ly) = ∑ ½ k² |ψ̂|² / (Lx Ly).
 """
 energy(sol, grid) = parsevalsum2(sqrt.(grid.Krsq) .* grid.invKrsq .* sol, grid) / (2 * grid.Lx * grid.Ly)
 energy(prob) = energy(prob.sol, prob.grid)