Fix spelling mistakes

These were found with:
codespell -w $(git ls-files | grep "\.[hc]\(pp\)\?$")

At some point in the future, we might want to get this enabled in CI.

Change-Id: Iccb57b2adfd06a2e177e99db2923fe4e8e329118
Signed-off-by: Ed Tanous <ed@tanous.net>
diff --git a/redfish-core/lib/account_service.hpp b/redfish-core/lib/account_service.hpp
index a6b8c49..d897fcd 100644
--- a/redfish-core/lib/account_service.hpp
+++ b/redfish-core/lib/account_service.hpp
@@ -152,7 +152,7 @@
         }
         else
         {
-            // Invalid user group name. Caller throws an excption.
+            // Invalid user group name. Caller throws an exception.
             return false;
         }
     }