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What problem is this PR intended to solve?
There are outdated comments in the code. The standard changed and the comments either reflected an earlier version of the standard or described how the standard was going to change.
The first comment is incorrect. The fragment case was changed to match
the nonfragment case in whatwg/html#6399.
The outdated comments were discovered while investigating #2335.
Have you included adequate test coverage?
There is no functional change and no tests were added.
Does this change affect the behavior of either the C or the Java implementations?
Neither.