coding_18845_edit_comment

- [ ] Coding functions
    - [ ] create fucntion put_update_comment  - (in controller)
    - [ ] create function update_comment($data) - (in model)
- [ ] unit testing
    - [ ] create function update_comment_ok (controller)
    - [ ] create function update_comment_notok( controller)
    - [ ] create function update_comment_ok (model)
    - [ ] create function update_comment_notok( model)