Fix diagram in documentation of MPS reader

Signed-off-by: Hanno Becker <hanno.becker@arm.com>
diff --git a/library/mps_reader.c b/library/mps_reader.c
index 62186c9..ee2312c 100644
--- a/library/mps_reader.c
+++ b/library/mps_reader.c
@@ -294,7 +294,7 @@
              *        +------v-------------v------+
              *        |          acc              |
              *        +---------------------------+
-             *                      |              |
+             *                      |             |
              *                fo/frag_offset   aa/acc_available
              *
              *