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: I1e57d16dd4e8655d698e272e6ee347d80e2056ba
Signed-off-by: Manojkiran Eda <manojkiran.eda@gmail.com>
diff --git a/src/transportcommands.cpp b/src/transportcommands.cpp
index 9aee32d..6e334d1 100644
--- a/src/transportcommands.cpp
+++ b/src/transportcommands.cpp
@@ -81,7 +81,7 @@
             break;
         case SOL_PARAM_SOL_THRESHOLD:
             *res++ = 0x00;
-            /* Byte 2: Char send thresold: setting this value to 1 means
+            /* Byte 2: Char send threshold: setting this value to 1 means
              * that BMC to send packet as soon as first character arrived.
              */
             *res++ = 0x01;