I had some code that looked a little like this:
local s = "some string".. "[[" .. "some link" .. "]]" .. "some string"
trying to comment out this whole thing doesn't really work - then multiline comment ends at the second line, despite the fact that the ]] are in a string.
This is how comments work: everything until the end-delimiter is part of the comment, regardless of whatever potential syntax might exist were the comment interpreted as code.
You can use alternative comment delimiters such as --[=[ ... ]=], --[==[ ... ]==], and so on to avoid this issue.