Updating cluster computer slide presenter notes.

[lcoghill]

Updating presenter notes for cluster computer that were duplicated from the "cloud computing" slides. Attempting to address issue 419.

[reid-a]

Grammar error on line 149 -- hopefully an easy fix!

[reid-a]

Thanks for this! I did catch one apparent grammar error in the change, it's noted above, but I think it's an easy fix.

Also, apparently your contribution is failing the continuous-integration workflow with a spelling error ("scrip" for "script') in README.md, which I think you did not modify? So I'm not sure I understand that part.

[reid-a]

I have made a separate PR, #423, which addresses the CI build error -- once that's merged into the main repo, and incorporated into this PR, things should work.

[reid-a]

I have taken the liberty of updating the branch upstream to incorporate the spelling correction -- once the requested changes have been made, this PR should be good to merge, assuming the CI runs successfully.

[reid-a]

I should say, once the requested changes have been addressed -- you don't have to do what was asked, but you do need to either make the case for the existing version, or propose other changes. Thanks again for contributing!

[reid-a]

I have taken the liberty of making my requested grammar fix directly on the branch. Will merge ASAP.

Should not be taken to detract from the value of this contribution, this is terrific!