writerfilter: ST_HrdFtr -> ST_HdrFtr

Change-Id: I78d4e9a3916eeda83f73fb416aafd07e25253be4
writerfilter: remove unused BOOKMARKNAME in doctok

Change-Id: If2d1a6eaa0939fe6e9012f4324f2b69ba7d798d4
writerfilter: remove unused ISTARTAT in doctok

Change-Id: I28124d68c195cbe5850e97af004ae5e6dc523f4a
writerfilter: remove unused NFC in doctok

Change-Id: I224d6192d3e98172b76311a870c48493928ff900