gen_plug_in_utils.py code spell fix

Change-Id: I8fc00c2591d40546f79c6debe686a9a83a062fff
Signed-off-by: George Keishing <gkeishin@in.ibm.com>
diff --git a/lib/gen_plug_in_utils.py b/lib/gen_plug_in_utils.py
index be31fb4..1d0c78e 100755
--- a/lib/gen_plug_in_utils.py
+++ b/lib/gen_plug_in_utils.py
@@ -516,7 +516,7 @@
     In a scenario like this, Example_plug_in/cp_setup may be called once
     directly by master_wrapper (the master) and and then called again directly
     by obmc_boot_test.py (the child).  Some plug-in programs may wish to avoid
-    doing any processing on the second such call.  This function will acheive
+    doing any processing on the second such call.  This function will achieve
     that purpose.
 
     This function will print a standard message to stdout prior to exiting.