documentation/doxygen: silence a warning.

Hopefully this wasn't omitted there for some testing purpose.

diff --git a/documentation/test_doxygen/contents_custom/input.dox b/documentation/test_doxygen/contents_custom/input.dox
index b3ae71d65cb0bd571de33b1c1105b8fdd49f3fda..42778e153654f158fe29b0751dbbb9d711b1668b 100644 (file)
--- a/documentation/test_doxygen/contents_custom/input.dox
+++ b/documentation/test_doxygen/contents_custom/input.dox
@@ -71,7 +71,7 @@ above note. WHAT THE HELL!!!
 @m_class{m-code-figure}
 
 @parblock
-@code
+@code{.cpp}
 // this is the code
 printf("The answer to the universe and everything is %d.", 5*9)
 @endcode