chore(kb): convert placeholders to articles

knowledge base/xml.md

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+# XML
+
+TODO
+
+Intro
+
+<!-- Remove this line to uncomment if used
+## Table of contents <!-- omit in toc -->
+
+1. [TL;DR](#tldr)
+1. [Further readings](#further-readings)
+   1. [Sources](#sources)
+
+## TL;DR
+
+<!-- Uncomment if used
+<details>
+  <summary>Setup</summary>
+
+```sh
+```
+
+</details>
+-->
+
+<details>
+  <summary>Usage</summary>
+
+```sh
+xml sel -t -v 'configuration/gui/password' 'Library/Application Support/Syncthing/config.xml'
+xml ed -L -d 'configuration/gui/password' 'Library/Application Support/Syncthing/config.xml'
+```
+
+</details>
+
+<!-- Uncomment if used
+<details>
+  <summary>Real world use cases</summary>
+
+```sh
+```
+
+</details>
+-->
+
+## Further readings
+
+- [Website]
+- [Codebase]
+
+### Sources
+
+- [5 simple ways to parse an XML file on Linux]
+- [`xmllint` cheatsheet][xmllint command cheatsheet]
+- [`xml` cheatsheet][xml command cheatsheet]
+
+<!--
+  Reference
+  ═╬═Time══
+  -->
+
+<!-- In-article sections -->
+<!-- Knowledge base -->
+<!-- Files -->
+<!-- Upstream -->
+<!-- Others -->
+[5 simple ways to parse an xml file on linux]: https://www.fosslinux.com/114195/ways-to-parse-an-xml-file-on-linux.htm
+[xmllint command cheatsheet]: https://cheat.sh/xmllint
+[xml command cheatsheet]: https://cheat.sh/xml