apps/examples/battery/Makefile:Fix mistakes in comments

Fix mistakes in comments

Author: simbit18

examples/battery/Makefile

@@ -1,5 +1,5 @@
 ############################################################################
-# apps/examples/batt/Makefile
+# apps/examples/battery/Makefile
 #
 # Licensed to the Apache Software Foundation (ASF) under one or more
 # contributor license agreements.  See the NOTICE file distributed with
@@ -27,7 +27,7 @@ PRIORITY  = $(CONFIG_EXAMPLES_BATTERY_PRIORITY)
 STACKSIZE = $(CONFIG_EXAMPLES_BATTERY_STACKSIZE)
 MODULE    = $(CONFIG_EXAMPLES_BATTERY)
 
-# Hello, World! Example
+# Battery Example
 
 MAINSRC = batt_main.c