[9.2] fix step-70 doxygen formula

fix broken formula (no & allowed in multline)

diff --git a/examples/step-70/doc/intro.dox b/examples/step-70/doc/intro.dox
index 24a10dc67d9811237079bb67f233c4d12ecca047..7cdbabadc93ef8e012d359550e798ce68a0af910 100644 (file)
--- a/examples/step-70/doc/intro.dox
+++ b/examples/step-70/doc/intro.dox
@@ -288,7 +288,7 @@ the stabilization ones, can be neglected from the formulation, resulting in
 the following final form of the variational formulation:
 
 @f{multline*}{
-(\nabla \textbf{v}, \nabla \textbf{u})_{\Omega} - & (\textrm{div}\;  \textbf{v}, p)_{\Omega}
+(\nabla \textbf{v}, \nabla \textbf{u})_{\Omega} - (\textrm{div}\;  \textbf{v}, p)_{\Omega}
   - (q, \textrm{div}\; \textbf{u})_{\Omega}  + 2\beta (\textbf{v},\textbf{u})_{\Gamma} \\
 =  2\beta (\textbf{v},\textbf{g})_{\Gamma}.
 @f}