Update cheatsheets

xml-depyx

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# xml depyx
+
+> Convert a PYX (ESIS - ISO 8879) document to XML format.
+> More information: <http://xmlstar.sourceforge.net/docs.php>.
+
+- Convert a PYX (ESIS - ISO 8879) document to XML format:
+
+`xml depyx {{path/to/input.pyx|URI}} > {{path/to/output.xml}}`
+
+- Convert a PYX document from `stdin` to XML format:
+
+`cat {{path/to/input.pyx}} | xml depyx > {{path/to/output.xml}}`
+
+- Display help:
+
+`xml depyx --help`