Editorial corrections & cleanups

[ChristianGruen]

XQFO:

• fn:hours-from-dateTime: Wrong example: year-from-dateTime( xs:time("12:30:00") ) → https://github.com/qt4cg/qtspecs/pull/1517/files#diff-7625c07ae8131ff65c3caa677b188ed2b9b66237312d11c05a2fa2838c6f5c67R9794
• fn:void: “Formal Specification” should be dropped. As it is ·implementation-dependent· whether the supplied argument is evaluated or ignored, the empty sequence may not be equivalent.
• fn:parse-uri: Ampersands in 4th example (...&sort=relevance) must be escaped.
• fn:format-number: format-number(0.14, '01%', {'percent': '%:pc')
• Unify equivalent expressions
• fn:civil-timezone: $dateTime → $value
• fo-test-fn-siblings-002

XPath:

• Add changes section for =?> (720 Add lookup arrow expressions (method invocations) #985)

XQuery:

• declare record p:person {$first as xs:string, $last as xs:string, *);
• declare type app:invoice as map("xs:string", element(inv:paid-invoice))
• declare type app:overdue-invoices as map("xs:date", app:invoice*)

General:

• Format code (see Formatting XPath/XQuery: Preferences, Conventions #1124)