Move pages under tldr, lint run.sh, update docs

tldr/xml-pyx

@@ -0,0 +1,21 @@
+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# xml pyx
+
+> Convert an XML document to PYX (ESIS - ISO 8879) format.
+> More information: <http://xmlstar.sourceforge.net/docs.php>.
+
+- Convert an XML document to PYX format:
+
+`xml pyx {{path/to/input.xml|URI}} > {{path/to/output.pyx}}`
+
+- Convert an XML document from `stdin` to PYX format:
+
+`cat {{path/to/input.xml}} | xml pyx > {{path/to/output.pyx}}`
+
+- Display help:
+
+`xml pyx --help`