Note Java 25+ requirement for RDF formatter; tidy changelogs

Combine the duplicate `## Changes` section in the lib changelog into
[Unreleased], append the Java 25+ requirement to the RDF/turtle bullets
in lib and maven, and fix the `ii#` typo in the maven changelog header.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: nedtwigg

CHANGES.md

@@ -13,12 +13,10 @@ We adhere to the [keepachangelog](https://keepachangelog.com/en/1.0.0/) format (
 ### Added
 - Add support for Java formatting via [`prince-of-space`](https://github.com/agustafson/prince-of-space). ([#2991](https://github.com/diffplug/spotless/pull/2991))
 ### Changes
+- Replace RDF formatter library `de.atextor:turtle-formatter` (discontinued) with `cool.rdf:cool-rdf-formatter` (its new coordinates); the RDF/turtle formatter now requires Java 25+. ([#2995](https://github.com/diffplug/spotless/pull/2995))
 - Bump default `greclipse` version to latest `4.39` -> `4.40`. ([#2989](https://github.com/diffplug/spotless/pull/2989))
 - Bump default `tabletest-formatter` version `1.1.1` -> `1.1.2`.
 
-## Changes
-- Replace RDF formatter library `de.atextor:turtle-formatter` (discontinued) with `cool.rdf:cool-rdf-formatter` (its new coordinates).  
-
 ## [4.8.0] - 2026-06-29
 ### Added
 - Add support for custom string format for license header copyright year via `yearStringFormat()`. ([#2965](https://github.com/diffplug/spotless/pull/2965))

plugin-maven/CHANGES.md

@@ -1,12 +1,12 @@
-ii# spotless-plugin-maven releases
+# spotless-plugin-maven releases
 
 We adhere to the [keepachangelog](https://keepachangelog.com/en/1.0.0/) format (starting after version `1.27.0`).
 
 ## [Unreleased]
 ### Added
 - Add support for Java formatting via [`prince-of-space`](https://github.com/agustafson/prince-of-space) with the new `<princeOfSpace>` step. ([#2991](https://github.com/diffplug/spotless/pull/2991))
 ### Changes
-- Replace RDF formatter library `de.atextor:turtle-formatter` (discontinued) with `cool.rdf:cool-rdf-formatter` (its new coordinates).
+- Replace RDF formatter library `de.atextor:turtle-formatter` (discontinued) with `cool.rdf:cool-rdf-formatter` (its new coordinates); the RDF/turtle formatter now requires Java 25+. ([#2995](https://github.com/diffplug/spotless/pull/2995))
 - Bump default `greclipse` version to latest `4.39` -> `4.40`. ([#2989](https://github.com/diffplug/spotless/pull/2989))
 - Bump default `tabletest-formatter` version `1.1.1` -> `1.1.2`.