D11607: Update systemsettings docbook to 5.12

[Burkhard Lück]

lueck created this revision.
lueck added reviewers: Plasma, Documentation.
Restricted Application added a project: Plasma.
Restricted Application added subscribers: kde-doc-english, plasma-devel.
lueck requested review of this revision.

REVISION SUMMARY
  proofread
  bump date + releaseinfo
  System Splash renamed to Boot Splash
  Other Notifications not in plasma workspace
  add Sidebar View

TEST PLAN
  checkXML5 index.docbook

REPOSITORY
  R124 System Settings

REVISION DETAIL
  https://phabricator.kde.org/D11607

AFFECTED FILES
  doc/index.docbook

To: lueck, #plasma, #documentation
Cc: plasma-devel, kde-doc-english, ZrenBot, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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