Description:
It is a regression. 

Adding comments to source file doesn't affect documentation property of UML
class element.

steps to reproduce:
1. create package with scoped diagram
2. place 'a' class
4. in source add the following documentation to the class:
/**
* some class documentation
*/
5. save modified source file.
7. switch to model and check documentation value class uml node.

Documentstion value should be the same as in src, but it is empty.