Documentation: use of number() in add_1(m) example

As shown in the [Forum](https://community.notepad-plus-plus.org/post/50286), the `number()` call that's in your `add_1` function in the [scintilla.rst](https://github.com/bruderstein/PythonScript/blob/master/docs/source/scintilla.rst) example for the `rereplace()` method doesn't seem to be a valid Python2.7 function.  `int()` works in its place.