Apply suggestions from @gonuke code review

Co-authored-by: Paul Wilson <[email protected]>

Author: abachma2

source/user/tutorial/add_proto.rst

@@ -22,7 +22,7 @@ It offers its material as a single commodity. If a composition recipe is
 specified, it provides that single material composition to requesters. If 
 unspecified, the source provides materials with the exact requested compositions. 
 The inventory size and throughput both default to infinite. Supplying material 
-from the Source prototype 
+from an instance of a Source prototype that is deployed in a simulation
 results in a corresponding decrease in inventory, and when the inventory size 
 reaches zero, the source can provide no more material.
 

source/user/tutorial/add_reg_inst.rst

@@ -9,7 +9,7 @@ Institution agents that exist within a Region agent.  This series of ownership
 allow for control of the interaction behavior
 between agents.  For example, two facilities 
 may not be allowed to trade if they are in two different regions. For commodities, 
-an institution can apply a higher preference for transactions within the 
+an institution may apply a higher preference for transactions within the 
 same institution; similarly, a region may negate any transfers of
 material which have a higher uranium enrichment than is allowable.