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/ethernet.hpp b/redfish-core/lib/ethernet.hpp
index a76b01b..b1a9f69 100644
--- a/redfish-core/lib/ethernet.hpp
+++ b/redfish-core/lib/ethernet.hpp
@@ -880,7 +880,7 @@
         }
     };
     // Passing null for gateway, as per redfish spec IPv6StaticAddresses object
-    // does not have assosiated gateway property
+    // does not have associated gateway property
     crow::connections::systemBus->async_method_call(
         std::move(createIpHandler), "xyz.openbmc_project.Network",
         "/xyz/openbmc_project/network/" + ifaceId,
@@ -936,7 +936,7 @@
             }
 
             extractIPV6Data(ethiface_id, resp, ipv6Data);
-            // Finally make a callback with usefull data
+            // Finally make a callback with useful data
             callback(true, ethData, ipv4Data, ipv6Data);
         },
         "xyz.openbmc_project.Network", "/xyz/openbmc_project/network",
@@ -978,7 +978,7 @@
                     if (interface.first ==
                         "xyz.openbmc_project.Network.EthernetInterface")
                     {
-                        // Cut out everyting until last "/", ...
+                        // Cut out everything until last "/", ...
                         const std::string& iface_id = objpath.first.str;
                         std::size_t last_pos = iface_id.rfind("/");
                         if (last_pos != std::string::npos)