Typo fix changes

Change-Id: I7096b2c6fc01d94cac87a904911b45a13e538d70
Signed-off-by: George Keishing <gkeishin@in.ibm.com>
diff --git a/lib/boot_data.py b/lib/boot_data.py
index 37e4b7f..cfd96ec 100755
--- a/lib/boot_data.py
+++ b/lib/boot_data.py
@@ -379,7 +379,7 @@
                                     text announcing the start of a boot test.
     max_boot_history                The max number of entries to be kept in
                                     the boot_history list.  The oldest entries
-                                    are deleted to acheive this list size.
+                                    are deleted to achieve this list size.
     """
 
     boot_history.append(boot_start_message)