D9896: Update doc-primer

[Burkhard Lück]

lueck created this revision.
lueck added a reviewer: Documentation.
lueck requested review of this revision.

REVISION SUMMARY
  update DTD to 4.5
  add 	​CC BY-SA 4.0 license
  add www.freethesaurus.com
  remove section about fdl in kde, no longer relevant

TEST PLAN
  checkXML5

REPOSITORY
  R883 Subversion

REVISION DETAIL
  https://phabricator.kde.org/D9896

AFFECTED FILES
  www/areas/l10n/docs/doc-primer/index.docbook

To: lueck, #documentation
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