[AMK, Lua] Loops fixed, formatting fixes, added comment

[Flibe-XI]

Added comment describing table in mission 9 (rescue) Changed loops to use enum values

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• I understand that if I do not agree to the following points by completing the checkboxes my PR will be ignored.
• I understand I should leave resolving conversations to the LandSandBoat team so that reviewers won't miss what was said.
• I have read and understood the Contributing Guide and the Code of Conduct.
• I have tested my code and the things my code has changed since the last commit in the PR and will test after any later commits.

What does this pull request do?

Addresses comments in #5551 . Loops in mission 9 to use enum values, added comment to describe the markerset matrix, misc formatting.

Steps to test these changes

!addmission 10 8
collect key items for navaratna talisman in quicksand caves