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: I13bbeeb8f1467efc1cf8748e1a66343e879dfc8a
Signed-off-by: Gunnar Mills <gmills@us.ibm.com>
diff --git a/extended/test_bios_update.robot b/extended/test_bios_update.robot
index 1b4305c..af734f4 100644
--- a/extended/test_bios_update.robot
+++ b/extended/test_bios_update.robot
@@ -61,7 +61,7 @@
     Run Key  Wait Until Keyword Succeeds \ 7 min \ 10 sec \ Is PNOR Flash Done
 
 Validate Power On
-    [Documentation]  Power the host on, and validate that the sytem booted.
+    [Documentation]  Power the host on, and validate that the system booted.
     [Teardown]  Validate Power On Teardown
 
     # Have to start SOL logging here.  Starting SOL in test setup closes the