Doc: update Contentmanipulation example docs

- Update screenshot
- Remove second \brief command
- Fix grammar issues
- Use standard phrasing for examples
- Replace \snippet commands with \quotefromfile commands.
  This enables documenting each line of code separately
- Replace occurrences of QWebView with QWebEngineView
- Replace reference to the obsolete QWebEnginePage::evaluateJavaScript
  method with reference to QWebEnginePage::runJavaScript() that is used
  in the example code
- Remove snippet markers from mainwindow.h and mainwindow.cpp
- Move code comment from mainwindow.cpp to the documentation to make the
  code leaner

Change-Id: If3346810c8aef67c15c9ec7ad4469a222e636cf2
Reviewed-by: Joerg Bornemann <joerg.bornemann@theqtcompany.com>

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