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: I611b83efacd76580d19d91acfb6c6e8a09f40f4a
Signed-off-by: Manojkiran Eda <manojkiran.eda@gmail.com>
diff --git a/main.cpp b/main.cpp
index cded6cf..4785044 100644
--- a/main.cpp
+++ b/main.cpp
@@ -219,7 +219,7 @@
         reporter->value(std::make_tuple(~code, secondary_post_code_t{}), true);
         reporter->value(std::make_tuple(code, secondary_post_code_t{}));
 
-        // read depends on old data being cleared since it doens't always read
+        // read depends on old data being cleared since it doesn't always read
         // the full code size
         code = 0;