Split example blocks to separate solve and output

- Separate solve() call from println statements in example-control-and-variable.md
- Separate solve() call from println statements in example-control-free.md
- Improves documentation rendering and code block organization

Author: ocots

docs/src/example-control-and-variable.md

@@ -62,6 +62,9 @@ nothing # hide
 
 ```@example main-growth-cv
 direct_sol = solve(ocp; grid_size=20, display=false)
+```
+
+```@example main-growth-cv
 println("Estimated growth rate: λ = ", variable(direct_sol))
 println("Objective value: ", objective(direct_sol))
 nothing # hide

docs/src/example-control-free.md

@@ -226,6 +226,9 @@ nothing # hide
 
 ```@example main-harmonic
 direct_sol = solve(ocp; grid_size=20, display=false)
+```
+
+```@example main-harmonic
 println("Optimal pulsation: ω = ", variable(direct_sol))
 println("Objective value: ω² = ", objective(direct_sol))
 println("Expected: ω = π/2 ≈ 1.5708, ω² ≈ 2.4674")