PR 116: Update the extension function section titles to be the function name

XProc specifications published by continuous integration on 09 Apr 2026 for PR 116.

Fix #104

Once the section titles had been changed, it seemed sensible to put them in alphabetical order. That’s going to lead to the appearance of much more significant changes than are actually present. This is a purely editorial PR; the only change is to the section titles.

Specifications marked with ⏵ are likely to have been changed by this commit.

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Commit: 8efca5739979534e66f92dabac1c2c9085a51e1a