fix doxygen tag

No idea what the nonsense about cargo-cult in the previous two commits
was about though.

Change-Id: I97a7a39ad431e5ab9eab4de6de2b08d4d6889307

include/sal/log-areas.dox

@@ -290,7 +290,7 @@ certain functionality.
 @li @c writerfilter
 @li @c writerfilter.profile - load times of filters
 
-&section writerperfect
+@section writerperfect
 
 @li @c writerperfect