[ci skip] update PGstar plots in 'Running MESA' to match current behaviour

Author: warrickball

docs/source/using_mesa/hr_000200.png

@@ -126,10 +126,10 @@ MESA will keep you updated via terminal output that looks like this:
 
 MESA will also display some pgstar plots that look like:
 
-.. figure:: hr_000800.png
+.. figure:: hr_000200.png
    :alt: HR Diagram
 
-.. figure:: trho_profile_000800.png
+.. figure:: trho_profile_000200.png
    :alt: TRho Profile
 
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