Two corrections of "Atributes table"

line 83: In the :guilabel:`Atributes table` enable editing.  ----> `Atributes table` should be `Attribute table` for reasons of consistency (also 2 't"s)

line 101: In the guilabel:`Atributes table` for the  ----> guilabel:`Atributes table` missing colon and "t" as well as superfluous "s", should be :guilabel:`Attribute table` for reasons of consistency
Merge pull request #390 from DiGro/patch-1

Two corrections of "Atributes table"