Update cheatsheets

xml-canonic

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# xml canonic
+
+> Make XML documents canonical.
+> More information: <http://xmlstar.sourceforge.net/docs.php>.
+
+- Make an XML document canonical, preserving comments:
+
+`xml canonic {{path/to/input.xml|URI}} > {{path/to/output.xml}}`
+
+- Make an XML document canonical, removing comments:
+
+`xml canonic --without-comments {{path/to/input.xml|URI}} > {{path/to/output.xml}}`
+
+- Make XML exclusively canonical, using an XPATH from a file, preserving comments:
+
+`xml canonic --exc-with-comments {{path/to/input.xml|URI}} {{path/to/c14n.xpath}}`
+
+- Display help:
+
+`xml canonic --help`