chore(ia): XPath docs

[bsmth]

Description

XPath reorg PR. Directory now has this structure:

./files/en-us/web/xpath
├── guides
│   ├── comparison_with_css_selectors
│   ├── introduction_to_using_xpath_in_javascript
│   └── snippets
└── reference
    ├── axes
    └── functions

Motivation

Docs IA & maintenance tasks

Approved in #37895 (review) but history was borked, so reopening.

[github-actions]

Preview URLs (52 pages)

• /en-US/docs/MDN/Writing_guidelines/Page_structures/Page_types/Page_type_key
• /en-US/docs/Mozilla/Firefox/Releases/3.6/Updating_extensions
• /en-US/docs/Mozilla/Firefox/Releases/3.6
• /en-US/docs/Web/API/Document/createNSResolver
• /en-US/docs/Web/API/Document/evaluate
• /en-US/docs/Web/XPath/Guides/Comparison_with_CSS_selectors
• /en-US/docs/Web/XPath/Guides/Introduction_to_using_XPath_in_JavaScript
• /en-US/docs/Web/XPath/Guides/Snippets
• /en-US/docs/Web/XPath/Guides
• /en-US/docs/Web/XPath/Reference/Axes
• /en-US/docs/Web/XPath/Reference/Functions/boolean
• /en-US/docs/Web/XPath/Reference/Functions/ceiling
• /en-US/docs/Web/XPath/Reference/Functions/choose
• /en-US/docs/Web/XPath/Reference/Functions/concat
• /en-US/docs/Web/XPath/Reference/Functions/contains
• /en-US/docs/Web/XPath/Reference/Functions/count
• /en-US/docs/Web/XPath/Reference/Functions/current
• /en-US/docs/Web/XPath/Reference/Functions/document
• /en-US/docs/Web/XPath/Reference/Functions/element-available
• /en-US/docs/Web/XPath/Reference/Functions/false
• /en-US/docs/Web/XPath/Reference/Functions/floor
• /en-US/docs/Web/XPath/Reference/Functions/format-number
• /en-US/docs/Web/XPath/Reference/Functions/function-available
• /en-US/docs/Web/XPath/Reference/Functions/generate-id
• /en-US/docs/Web/XPath/Reference/Functions/id
• /en-US/docs/Web/XPath/Reference/Functions/key
• /en-US/docs/Web/XPath/Reference/Functions/lang
• /en-US/docs/Web/XPath/Reference/Functions/last
• /en-US/docs/Web/XPath/Reference/Functions/local-name
• /en-US/docs/Web/XPath/Reference/Functions/name
• /en-US/docs/Web/XPath/Reference/Functions/namespace-uri
• /en-US/docs/Web/XPath/Reference/Functions/normalize-space
• /en-US/docs/Web/XPath/Reference/Functions/not
• /en-US/docs/Web/XPath/Reference/Functions/number
• /en-US/docs/Web/XPath/Reference/Functions/position
• /en-US/docs/Web/XPath/Reference/Functions/round
• /en-US/docs/Web/XPath/Reference/Functions/starts-with
• /en-US/docs/Web/XPath/Reference/Functions/string-length
• /en-US/docs/Web/XPath/Reference/Functions/string
• /en-US/docs/Web/XPath/Reference/Functions/substring-after
• /en-US/docs/Web/XPath/Reference/Functions/substring-before
• /en-US/docs/Web/XPath/Reference/Functions/substring
• /en-US/docs/Web/XPath/Reference/Functions/sum
• /en-US/docs/Web/XPath/Reference/Functions/system-property
• /en-US/docs/Web/XPath/Reference/Functions/translate
• /en-US/docs/Web/XPath/Reference/Functions/true
• /en-US/docs/Web/XPath/Reference/Functions/unparsed-entity-url
• /en-US/docs/Web/XPath/Reference/Functions
• /en-US/docs/Web/XPath/Reference
• /en-US/docs/Web/XPath
• /en-US/docs/Web/XSLT/Guides/Transforming_XML_with_XSLT
• /en-US/docs/Web/XSLT/Reference/Element/number

Flaws (25)

Note! 50 documents with no flaws that don't need to be listed. 🎉

URL: /en-US/docs/Mozilla/Firefox/Releases/3.6
Title: Firefox 3.6 for developers
Flaw count: 23

• broken_links:
  • Can't resolve /en-US/docs/JavaScript/ECMAScript_5_support_in_Mozilla
  • Can't resolve /en-US/docs/DOM/MozOrientation
  • Can't resolve /en-US/docs/DOM/Detecting_document_width_and_height_changes
  • Can't resolve /en-US/docs/DOM/MozOrientation
  • Can't resolve /en-US/docs/Monitoring_HTTP_activity
  • and 17 more flaws omitted
• macros:
  • Can't resolve /en-US/docs/Web/API/Node/mozMatchesSelector

---

URL: /en-US/docs/Mozilla/Firefox/Releases/3.6/Updating_extensions
Title: Updating extensions for Firefox 3.6
Flaw count: 2

• broken_links:
  • Can't resolve /en-US/docs/DOM/node.tagName
  • Can't resolve /en-US/docs/Chrome_Registration

External URLs (2)

URL: /en-US/docs/Web/XPath
Title: XPath

• https://extendsclass.com/xpath-tester.html (1 time) (Note! This may be a new URL 👀)
• https://www.xml.com/pub/a/2000/08/holman/ (1 time) (Note! This may be a new URL 👀)

[bsmth]

TY!