Update run-antora.adoc - files listed are incorrect.

The list of files shown after building the demo project are different than those given in the example docs.

Example demo doc files:

_
404.html
component-a
component-b
index.html
sitemap-component-a.xml
sitemap-component-b.xml
sitemap.xml

Local project files:

_
component-a
component-b
index.html