Fix another doxygen issue.

Test: Eyeballs
Bug: None
Change-Id: I0eb5c82498a532c88eb13fa72b41c720c6d8537e
(cherry picked from commit 12abc195bac9feedcc1447855c878f9b31a9e7c8)
diff --git a/include/android/system_fonts.h b/include/android/system_fonts.h
index dde9055..f0485a1 100644
--- a/include/android/system_fonts.h
+++ b/include/android/system_fonts.h
@@ -16,7 +16,7 @@
 
 /**
  * @addtogroup Font
- * {
+ * @{
  */
 
 /**