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: I014e7670ca4ba57f7e1b80e96c001474cf7a6676
Signed-off-by: Manojkiran Eda <manojkiran.eda@gmail.com>
diff --git a/static/item_updater_static.hpp b/static/item_updater_static.hpp
index 6fc39a0..f992994 100644
--- a/static/item_updater_static.hpp
+++ b/static/item_updater_static.hpp
@@ -19,7 +19,7 @@
 
   protected:
     /**
-     * @brief GARD factory reset - clears the PNOR GARD partition.
+     * @brief GUARD factory reset - clears the PNOR GUARD partition.
      */
     void reset() override;
 };