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: I7282eed4dd7df45ffd15d5e93820b7f3013252b7
Signed-off-by: Manojkiran Eda <manojkiran.eda@gmail.com>
diff --git a/test/physical.cpp b/test/physical.cpp
index b6fb35b..271143c 100644
--- a/test/physical.cpp
+++ b/test/physical.cpp
@@ -17,7 +17,7 @@
     /* If your tests need to touch the filesystem, always use mkdtemp() or
      * mkstemp() for creating directories and files. Tests can be run in
      * parallel with `make -j`, and if use the same path in multiple tests they
-     * will stomp on eachother and likely fail.
+     * will stomp on each other and likely fail.
      */
     static constexpr auto tmplt = "/tmp/MockLed.XXXXXX";
     std::array<char, MAXPATHLEN> buffer = {0};