D11724: Update dolphin docbook to 18.04

[Burkhard Lück]

lueck created this revision.
lueck added reviewers: Dolphin, Documentation.
Restricted Application added a subscriber: kde-doc-english.
lueck requested review of this revision.

REVISION SUMMARY
  proofread + update
  bump date + releaseinfo
  add missing option + new shortcuts

TEST PLAN
  checkXML5 index.docbook

REPOSITORY
  R318 Dolphin

REVISION DETAIL
  https://phabricator.kde.org/D11724

AFFECTED FILES
  doc/index.docbook

To: lueck, #dolphin, #documentation
Cc: kde-doc-english
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