Docx reader: Start adding comment to combine module

This module is one of the most opaque parts of the docx reader: it
deals with the fact that runs have non-nesting formatting, so we have
to figure out the nesting on the fly as we combine them.

We start adding commenting, so new developers can understand and, if
necessary, modify this module. Specific function comments will be
added in the future, but this offers a global description of the
purpose of the module.

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