step-42: fix doc header in code

diff --git a/examples/step-42/step-42.cc b/examples/step-42/step-42.cc
index ba684576533c05e37d4095a0404f9dbc28223e17..61fe72effd43239a9681f3a65f106afa83c0e349 100644 (file)
--- a/examples/step-42/step-42.cc
+++ b/examples/step-42/step-42.cc
@@ -260,7 +260,7 @@ namespace Step42
     stress_strain_tensor_linearized += stress_strain_tensor_kappa;
   }
 
-  // <h3>Equation data: boundary forces, boundary values, obstacles</h3>
+  // @sect3{Equation data: boundary forces, boundary values, obstacles}
   //
   // The following should be relatively standard. We need classes for
   // the boundary forcing term (which we here choose to be zero)