Fix spelling mistakes using codespell

This commit corrects various spelling mistakes throughout the
repository. The corrections were made automatically using `codespell`[1]
tool.

[1]: https://github.com/codespell-project/codespell

Change-Id: I539a0c5baa63be240fc1c76367c0af338dd89c7b
Signed-off-by: Manojkiran Eda <manojkiran.eda@gmail.com>
diff --git a/libpldmresponder/bios_config.cpp b/libpldmresponder/bios_config.cpp
index 82b3dfe..9883075 100644
--- a/libpldmresponder/bios_config.cpp
+++ b/libpldmresponder/bios_config.cpp
@@ -1079,7 +1079,7 @@
         }
     }
 
-    throw std::invalid_argument("Unknow attribute Name");
+    throw std::invalid_argument("Unknown attribute Name");
 }
 
 void BIOSConfig::constructPendingAttribute(