Course 8 - Fix path for plugin lesson

[davidnind]

For course 8, Publishing output from DITA sources, the path in step 1 of the Installing a custom plugin topic should be samples/plugins rather than samples/plugin.

File details: /en-us/course08-publishing_output/topics/lc_install_custom_plugin.dita (http://www.learningdita.com/topic/lc_install_custom_plugin/)

[simonbate]

Hi David,

Thanks for catching this omission. And thanks for submitting the pull request with the change.

We'll be implementing it shortly.

Thanks for contributing to LearningDITA; your comment and suggestions are always welcome.

Simon