Don't discuss internals in exported func comments.
Don't discuss internals in exported func comments.

This commit cleans up and moves a couple of comments in the recent pull
request which implements a rebroadcast handler (#114) in order to avoid
discussing internal state in the exported function comment.

How a function actually accomplishes the stated functionality is not
something that a caller is concerned with.  The details about the internal
state are better handled with comments inside the function body.

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