Update cheatsheets

ppmtopcx

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# ppmtopcx
+
+> Convert a PPM image to a PCX file.
+> More information: <https://netpbm.sourceforge.net/doc/ppmtopcx.html>.
+
+- Convert a PPM image to a PCX file:
+
+`ppmtopcx {{path/to/file.ppm}} > {{path/to/file.pcx}}`
+
+- Produce a PCX file with the specified color depth:
+
+`ppmtopcx -{{8bit|24bit}} {{path/to/file.ppm}} > {{path/to/file.pcx}}`