Word: Set content type for footnotes/endnotes
Word: Set content type for footnotes/endnotes

When converting from a text package to a docx file, ensure the OPC
package's [Content_Types].xml has entries for footnotes.xml and
endnotes.xml if they exist. Without this, if these files are present in
the package, Word will refuse to open the file, saying it's corrupt.

corinthia/corinthia-docformats,apache/incubator-corinthia,corinthia/corinthia-docformats,corinthia/corinthia-docformats,apache/incubator-corinthia,corinthia/corinthia-docformats,apache/incubator-corinthia,corinthia/corinthia-docformats,apache/incubator-corinthia,apache/incubator-corinthia,apache/incubator-corinthia,apache/incubator-corinthia