Course 8 - Refers to SourceForge website

[davidnind]

For course 8, Publishing output from DITA sources, /en-us/course08-publishing_output/topics/lc_installing_the_dita_ot.dita refers to the 'DITA OT SourceForge website'.

This should just refer to the 'DITA Open Toolkit website'.

[simonbate]

Hi David,

Thanks for the comment and thanks for the pull request containing the update. We're working on updating the course now.

Thanks again for all your input,
Simon