1.1)
user interface simpler → user interfaces simpler

1.3)
OS event to process → OS events to process

2.2)
the widget offer methods → the widget offers methods

2.3)
allows to set → allows you to set

2.4)
dispose such objects → dispose of such objects

2.5)
another examples for such → another example of such
methods which accepts → methods which accept
Ensure to test your code → Ensure you test your code

3.1)
allows to define → allows you to define

3.3)
dwithin → within

3.6.2)
does currently not support → currently does not support
hence the following examples avoid using them → hence avoid using the Javadoc examples

3.10) is a duplicate of 3.12)
3.11) is a duplicate of 3.13)
I confirmed these two are duplicates by copying the source listings into different files and using diff, which was silent thereby indicating no differences

4)
an code example → a code example

4.6)
allow to create → allow you to create
allow to set → allow you to set

4.7)
to a SWT widgets → to a SWT widget
an KeyEvent → a KeyEvent
(CTRL, ALT, SHIFT) → The interface file also lists COMMAND and the alt graphics key ALT_GR