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: Id20fef954fd977a307ba36dce5c8c7365aa96a6d
Signed-off-by: Gunnar Mills <gmills@us.ibm.com>
diff --git a/lib/bmc_network_utils.robot b/lib/bmc_network_utils.robot
index d8019f8..43a8d9d 100644
--- a/lib/bmc_network_utils.robot
+++ b/lib/bmc_network_utils.robot
@@ -249,6 +249,6 @@
     [Documentation]  Run build_net to preconfigure the ethernet interfaces.
 
     OS Execute Command  build_net help y y
-    # Run pingum to chech if the "build_net" was run correctly done.
+    # Run pingum to check if the "build_net" was run correctly done.
     ${output}  ${stderr}  ${rc}=  OS Execute Command  pingum
     Should Contain  ${output}  All networks ping Ok