Fix typographical errors and use system swift

[HendricksJudy]

Summary

• clean up comments and tests
• fix typographical mistakes across sources
• make swift path configurable

Testing

• make swift-fmt
• make test (fails: cannot compile ContainerizationOS due to missing system headers)

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https://chatgpt.com/codex/tasks/task_e_6849bad746548326bc9bdabe84221fb0

[HendricksJudy]

This pull request includes several updates to improve code maintainability, fix typos, and enhance usability. The changes include making the swift command path dynamic, correcting spelling and grammatical errors in comments, fixing a typo in a test case, and updating a script to dynamically locate the swift executable.

Code maintainability and usability improvements:

• Updated Makefile to dynamically locate the swift executable using command -v, replacing the hardcoded path. (Makefile, MakefileL21-R21)
• Modified scripts/make-docs.sh to use command -v swift for determining the swift executable path, improving portability. (scripts/make-docs.sh, scripts/make-docs.shL42-R42)

Typo and grammar fixes:

• Fixed grammatical errors in comments within Image.swift, improving clarity. (Sources/Containerization/Image/Image.swift, Sources/Containerization/Image/Image.swiftL118-R119)
• Corrected a spelling error in a comment in Platform.swift ("effictively" → "effectively"). (Sources/ContainerizationOCI/Platform.swift, Sources/ContainerizationOCI/Platform.swiftL266-R266)
• Fixed a typo in a test case in RegistryClientTests.swift ("conatinerization" → "containerization"). (Tests/ContainerizationOCITests/RegistryClientTests.swift, Tests/ContainerizationOCITests/RegistryClientTests.swiftL297-R297)