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: Icafafe827d67c9b6cc5c3f6bfb204fe425e91a32
Signed-off-by: Manojkiran Eda <manojkiran.eda@gmail.com>
diff --git a/src/item_updater.hpp b/src/item_updater.hpp
index b0e04eb..0ff2600 100644
--- a/src/item_updater.hpp
+++ b/src/item_updater.hpp
@@ -152,7 +152,7 @@
                          const std::string& psuVersion);
 
     /** @brief Remove Activation and Version object for PSU inventory
-     *  @details If the same version exists for mutliple PSUs, just remove
+     *  @details If the same version exists for multiple PSUs, just remove
      *           related association.
      *           If the version has no association, the Activation and
      *           Version object will be removed