Fix bad doxygen tags in font headers.

Test: Compared to other NDK headers.
Bug: None
Change-Id: If2ff22d1502ec8541e57aa26a5a42461abf9fdc7
diff --git a/include/android/font_matcher.h b/include/android/font_matcher.h
index e286a4c..0b8f892 100644
--- a/include/android/font_matcher.h
+++ b/include/android/font_matcher.h
@@ -16,7 +16,7 @@
 
 /**
  * @addtogroup Font
- * {
+ * @{
  */
 
 /**