use full-width commas in SAM example description as workaround for web interface issue with incorrectly interpreting commas in comment lines as comment delineators

Author: softwareengineerprogrammer

tests/examples/example_SAM-single-owner-PPA.txt

@@ -1,7 +1,7 @@
 # Example: SAM Single Owner PPA Economic Model: 50 MWe
 # This example demonstrates a 50 MWe EGS project with similar engineering parameters to Fervo Cape Station.
-# The SAM Single Owner PPA Economic Model calculates project NPV, after-tax IRR, and cash flow based on
-# electricity production, capital costs, and economic input parameters.
+# The SAM Single Owner PPA Economic Model calculates project NPV， after-tax IRR， and cash flow based on
+# electricity production， capital costs， and economic input parameters.
 # See "SAM Economic Models" in GEOPHIRES documentation: https://nrel.github.io/GEOPHIRES-X/SAM-Economic-Models.html
 
 # *** ECONOMIC/FINANCIAL PARAMETERS ***