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: Id21d7e92aa899635af034ff1ddeefabedd08660e
Signed-off-by: Manojkiran Eda <manojkiran.eda@gmail.com>
diff --git a/eth.cpp b/eth.cpp
index 8ee1397..1a68f9d 100644
--- a/eth.cpp
+++ b/eth.cpp
@@ -32,7 +32,7 @@
 namespace ipmi
 {
 
-// TOOD(venture): The ipmid.h has this macro, which is a header we
+// TODO(venture): The ipmid.h has this macro, which is a header we
 // can't normally access.
 #ifndef MAX_IPMI_BUFFER
 #define MAX_IPMI_BUFFER 64