Codespell redfish-core spelling fixes

These spelling errors were found using
https://github.com/codespell-project/codespell
Tested: Top commit (along with this) was built and ran against
        validator.
Change-Id: Ic9dce27b1de8567eedf7753164ef564d3aedf8ca
Signed-off-by: Gunnar Mills <gmills@us.ibm.com>
diff --git a/redfish-core/lib/task.hpp b/redfish-core/lib/task.hpp
index fe1468f..fb2d0be 100644
--- a/redfish-core/lib/task.hpp
+++ b/redfish-core/lib/task.hpp
@@ -174,7 +174,7 @@
             [self = shared_from_this()](boost::system::error_code ec) {
                 if (ec == boost::asio::error::operation_aborted)
                 {
-                    return; // completed succesfully
+                    return; // completed successfully
                 }
                 if (!ec)
                 {