Fix syntax error in tests.

There was a failing test caused by a syntax error in a test. The
solution is probably to improve the syntax in a new version and issue a
warning in older versions.

[SVN r51801]

tools/quickbook

@@ -1 +1 @@
-Subproject commit b4a24347b49a1a25296fe02bbdc643c0da825309
+Subproject commit 630f5f1e9fa4a4a4207bbe2780693ad072c20b58