Docx reader: Some code cleanup

 * clarify function name. We had previously used `getDocumentPath`,
   but `Document` is an overdetermined term here. Use
   `getDocumentXmlPath` to make clear what we're doing.

 * Use field notation for setting ReaderEnv. As we've added (and
   continue to add) fields, the assignment by position has gotten
   harder to read.

 * figure out document.xml path once at the beginning of parsing, and
   add it to the environment, so we can avoid repeated lookups.

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