"Getting Started" guide refers to code line numbers that don't exist

Issue
In "Getting Started Programming with Qt Widgets" page (http://doc-snapshot.qt-project.org/qt5-release/qtdoc/gettingstartedqt.html), the body text refers to line numbers of code snippets: "Line 4 defines... Line 6 creates... Line 8 shows...". However, the line numbers are not displayed.

This issue is important because this page is targeted at absolute beginners, who need to be guided through the logic. Missing references would likely slow them down and frustrate them.

History
Code snippets used to come with line numbers (http://doc.qt.digia.com/4.7/gettingstartedqt.html). This is no longer the case. EDIT: Actually, the line numbers were hard-coded into the Qt 4.8 documentation. Probably not something we want to promote.

Suggestion
I can think of two options:

1. Rewrite the tutorial to not require line numbers
2. Bring back line numbers in code snippets

Other
I did a regex search, "(L|l)ine [0-9]+", on all the repos that are part of Qt 5.1 – This is the only page that refers to line numbers.