Fix a typo.

diff --git a/examples/step-52/doc/intro.dox b/examples/step-52/doc/intro.dox
index d5ace992a0c8db2372e3315a514ef76bedaacf36..4164ba63e9e482626ecc1e61e7de5b60cd055eec 100644 (file)
--- a/examples/step-52/doc/intro.dox
+++ b/examples/step-52/doc/intro.dox
@@ -7,7 +7,7 @@ the UMFPACK sparse direct solver. Refer to the <a
 href="../../readme.html#umfpack">ReadMe</a> for instructions how to do this.
 
 <a name="Intro"></a>
-<h1>Introducion</h1>
+<h1>Introduction</h1>
 
 This program shows how to use Runge-Kutta methods to solve a time-dependent
 problem. It solves a small variation of the heat equation discussed first in