Use a scientific RPN HP calculator for g*math docs (#7755)

John noticed that we had a business HP RPN calculator! He had an actual scientific calculator that is just 2-3 year younger than GMT itself. This PR updates the fig.
GenericMappingTools · Aug 23, 2023 · 71afceb · 71afceb
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diff --git a/doc/fig/RPN_fig.jpg b/doc/fig/RPN_fig.jpg
diff --git a/doc/rst/source/RPN_info.rst_ b/doc/rst/source/RPN_info.rst_
@@ -6,4 +6,4 @@
    which is a post-fix system for mathematical notion originally developed by
    `Jan_Łukasiewicz <https://en.wikipedia.org/wiki/Jan_Łukasiewicz>`_ (right).
    Here, operands are entered first followed by an operator, e.g., "3 5 +" instead
-   of "3 + 5 =".
+   of "3 + 5 =" (photo courtesy of John W. Robbins).