Replace inc in pipelines example

[NotTheDr01ds]

Fixes #750 by removing the inc command from the example and replacing it with the built-in update.

But #750 also surfaced two other issues that need to be fixed:

• We don't provide any list of the "default" plugins that users can install
• The Commands Help includes commands from these plugins without differentiating them as requiring a plugin.

I'll open issues for these, but I think #750 can be closed with this

[fdncred]

I'm fine with this change but it would be nice to have a write up featuring our built-in plugins including the debug/example ones.