Correct typos (backport #961)

[mergify]

Description

I ran a typo check using typos and codespell

---

This is an automatic backport of pull request #961 done by Mergify.

[mergify]

Cherry-pick of b51d67a has failed:

On branch mergify/bp/jazzy/pr-961
Your branch is up to date with 'origin/jazzy'.

You are currently cherry-picking commit b51d67a.
  (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:   launch/launch/actions/execute_process.py
	modified:   launch/launch/launch_introspector.py
	modified:   launch/launch/utilities/type_utils.py
	modified:   launch_testing/launch_testing/asserts/assert_sequential_output.py
	modified:   launch_testing/launch_testing/markers.py
	modified:   launch_testing/launch_testing/test_runner.py
	modified:   launch_testing/test/launch_testing/test_io_handler_and_assertions.py
	modified:   launch_testing/test/launch_testing/test_resolve_process.py

Unmerged paths:
  (use "git add/rm <file>..." as appropriate to mark resolution)
	both modified:   launch/launch/actions/execute_local.py
	deleted by us:   launch/launch/actions/for_loop.py
	both modified:   launch/launch/substitutions/environment_variable.py
	deleted by us:   launch/launch/substitutions/string_join_substitution.py
	deleted by us:   launch_xml/test/launch_xml/test_for_loop.py
	deleted by us:   launch_yaml/test/launch_yaml/test_for_loop.py

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

[ahcorde]

Pulls: #963
Gist: https://gist.githubusercontent.com/ahcorde/6b8100fd1d05183a0c85249504669a4d/raw/9b2772e831b43f20442fc25b8fb82183743af6f9/ros2.repos
BUILD args: --packages-above-and-dependencies launch launch_testing launch_xml launch_yaml
TEST args: --packages-above launch launch_testing launch_xml launch_yaml
ROS Distro: jazzy
Job: ci_launcher
ci_launcher ran: https://ci.ros2.org/job/ci_launcher/18784

• Linux
• Linux-aarch64
• Linux-rhel
• Windows

[ahcorde]

• Linux
• Linux-aarch64
• Linux-rhel
• Windows