Removed unneeded comments
Removed unneeded comments

The first one is already on the documentation of
atk_implementor_ref_accessible.

Second one basic glib usage. If needed it should be placed
at documentation and not as a big comment on the main atk
object header.

Distrotech/atk,GNOME/at-spi2-core,Distrotech/atk,Distrotech/atk,GNOME/at-spi2-core,GNOME/at-spi2-core