Update cheatsheets

tldr/ppmglobe

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# ppmglobe
+
+> Generate strips of an image suitable to be glued onto a sphere.
+> See also: `pnmmercator`.
+> More information: <https://netpbm.sourceforge.net/doc/ppmglobe.html>.
+
+- Transform an image to strips that can be cut out and glues onto a sphere:
+
+`ppmglobe {{number_of_strips}} {{path/to/image.ppm}} > {{path/to/output.ppm}}`
+
+- Use the specified color for the areas between the strips:
+
+`ppmglobe -background {{red}} {{number_of_strips}} {{path/to/image.ppm}} > {{path/to/output.ppm}}`