Update gmtconvert.rst (#7686)

Teach column creation. Co-authored-by: Paul Wessel <pwessel@hawaii.edu>
GenericMappingTools · Jul 27, 2023 · 31c3d1b · 31c3d1b
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diff --git a/doc/rst/source/gmtconvert.rst b/doc/rst/source/gmtconvert.rst
@@ -369,6 +369,11 @@ To get all rows except those bad ones between rows 1000-2000, try::
 
     gmt convert junk.txt -q~1000-2000 > good.txt
 
+To convert miles into meters, centimeters, feet, yards, inches, and leagues, try::
+
+    gmt convert mi.txt -i0+s1609.344,0+s160934.4,0+s5280,0+s1670,0+s63360,0+d3 > mcfyil.txt
+
+
 See Also
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