Code cleanup (backport #485)

[mergify]

🦟 Bug fix

Fixes #

Summary

This PR fixes various typos and doing some minor C++ cleanup

Checklist

• Signed all commits for DCO
• Added tests
• Updated documentation (as needed)
• Updated migration guide (as needed)
• Consider updating Python bindings (if the library has them)
• codecheck passed (See contributing)
• All tests passed (See test coverage)
• While waiting for a review on your PR, please help review another open pull request to support the maintainers

Note to maintainers: Remember to use Squash-Merge and edit the commit message to match the pull request summary while retaining Signed-off-by messages.

---

This is an automatic backport of pull request #485 done by Mergify.

[mergify]

Cherry-pick of 9f05e35 has failed:

On branch mergify/bp/gz-msgs11/pr-485
Your branch is up to date with 'origin/gz-msgs11'.

You are currently cherry-picking commit 9f05e35.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	modified:   Changelog.md
	modified:   Migration.md
	modified:   cmake/gz_msgs_generate.cmake
	modified:   core/generator/Generator.cc
	modified:   core/include/gz/msgs/Factory.hh
	modified:   core/include/gz/msgs/MessageFactory.hh
	modified:   core/include/gz/msgs/convert/AxisAlignedBox.hh
	modified:   core/include/gz/msgs/convert/Color.hh
	modified:   core/include/gz/msgs/convert/DiscoveryType.hh
	modified:   core/include/gz/msgs/convert/FuelMetadata.hh
	modified:   core/include/gz/msgs/convert/GeometryType.hh
	modified:   core/include/gz/msgs/convert/Inertial.hh
	modified:   core/include/gz/msgs/convert/JointType.hh
	modified:   core/include/gz/msgs/convert/PixelFormatType.hh
	modified:   core/include/gz/msgs/convert/Plane.hh
	modified:   core/include/gz/msgs/convert/Pose.hh
	modified:   core/include/gz/msgs/convert/Quaternion.hh
	modified:   core/include/gz/msgs/convert/ShaderType.hh
	modified:   core/include/gz/msgs/convert/SphericalCoordinates.hh
	modified:   core/include/gz/msgs/convert/StdTypes.hh
	modified:   core/include/gz/msgs/convert/Vector2.hh
	modified:   core/include/gz/msgs/convert/make_stubs.py
	modified:   core/include/gz/msgs/detail/dynamic_message_cast.hh
	modified:   core/src/DynamicFactory.hh
	modified:   examples/generating_custom_msgs/CMakeLists.txt
	modified:   examples/generating_custom_msgs/README.md
	modified:   examples/generating_custom_msgs/main.cc
	modified:   examples/using_gz_msgs/main.cc
	modified:   gz-msgs-extras.cmake.in
	modified:   proto/gz/msgs/data_load_options.proto
	modified:   proto/gz/msgs/discovery.proto
	modified:   proto/gz/msgs/response.proto
	modified:   test/integration/gz_TEST.cc

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   core/src/MessageFactory.cc
	both modified:   tutorials/message_generation.md

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

[caguero]

Closed in favor of #497 .