HTML API: Satisfy return types in new methods

[dlh01]

Trac ticket: https://core.trac.wordpress.org/ticket/62018

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[dmsnell]

@dlh01 I've updated the comment and called $this->bail() in the HTML Processor, which would return false and bring the notice up for inspection, should someone want to investigate.

for the Tag Processor I returned the tag name instead of null since it was more in line with what ought to be there.

ultimately I'd rather not make these kind of code adjustments, but we already have a few where the tooling is wrong or the code isn't structured in a way that the tooling can understand. if we can rearrange the code so that it's not surprising in these ways that would seem like another nice improvement.

[dmsnell]

Merged in [59001]
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