Spelling fixes

Spelling errors found using github.com/lucasdemarchi/codespell
A tool to fix common misspellings.
This tool is licensed under GNU General Public License, version 2.

Change-Id: I99ddfba10e88b764554107ac6859502ef09c6234
Signed-off-by: Gunnar Mills <gmills@us.ibm.com>
diff --git a/tests/test_hardware_sensors.robot b/tests/test_hardware_sensors.robot
index ccd1d82..237bcb8 100644
--- a/tests/test_hardware_sensors.robot
+++ b/tests/test_hardware_sensors.robot
@@ -1,5 +1,5 @@
 *** Settings ***
-Documentation   Suite to test harware sensors.
+Documentation   Suite to test hardware sensors.
 
 Resource        ../lib/utils.robot
 Resource        ../lib/boot_utils.robot