step-85: typo in Section L^2-Error

diff --git a/examples/step-85/step-85.cc b/examples/step-85/step-85.cc
index 65add98187f1276cb7fffdadc09355cc5e1b2975..d4fe88c8155434c71640fb70271afe931f91282b 100644 (file)
--- a/examples/step-85/step-85.cc
+++ b/examples/step-85/step-85.cc
@@ -569,7 +569,7 @@ namespace Step85
 
 
 
-  // @sect3{$L^2$-Error}
+  // @sect3{L2-Error}
   // To test that the implementation works as expected, we want to compute the
   // error in the solution in the $L^2$-norm. The analytical solution to the
   // Poisson problem stated in the introduction reads