Updating cluster computer slide presenter notes.

Updating presenter notes for cluster computer that were duplicated from the "cloud computing" slides. Attempting to address issue [419](carpentries-incubator#419).

files/jargon.html

@@ -146,14 +146,10 @@
 
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-Cloud systems physically resemble clusters or supercomputers, but
-with greater heterogeneity among components, and less coupling, often
-without an interconnect at all. Cloud servers are generally accessed
-by connecting to their services over the network. Multiple virtual
-machines may reside on individual physical machines. Typical tasks
-are driven by user connections from the outside to the various "front
-end" services (e.g. web sites) which pass traffic on to the "back
-end" servers (e.g. databases) to present results to users.
+A collection of standalone computers that are networked together. The will
+frequently have software installed that allow the coordinated running of other
+software across all of these computers. This allows these networked computers
+to work together to accomplish computing tasks faster. 
 
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