D27512: README.md: fix example code & code markup

[Friedrich W. H. Kossebau]

kossebau created this revision.
kossebau added a reviewer: Kate.
Herald added projects: Kate, Frameworks.
Herald added subscribers: kde-frameworks-devel, kwrite-devel.
kossebau requested review of this revision.

REVISION SUMMARY
  - scope examples with ``` and code type
  - serviceByDesktopName is the correct method
  - drop 0 parameter from createInstance call (nullptr is default arg)
  - drop NO_MODULE from find_package(KF5TextEditor), not really needed, more simple example

REPOSITORY
  R39 KTextEditor

BRANCH
  fixreadme

REVISION DETAIL
  https://phabricator.kde.org/D27512

AFFECTED FILES
  README.md

To: kossebau, #kate
Cc: kwrite-devel, kde-frameworks-devel, rrosch, LeGast00n, cblack, GB_2, domson, michaelh, ngraham, bruns, demsking, cullmann, sars, dhaumann
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