docs: give 0.22.6 its own changelog block

Nine entries had been appended to the 0.22.5 block after 0.22.5 was already out,
so what shipped as 0.22.6 had no block at all — and the release script said so:
"changelog.json has no 'fr' entries for 0.22.6 - skipping". No Discord
announcement, and no What's-new for anyone updating.

The split is not guesswork: the changelog at tag v0.22.5 carried exactly one
entry, so everything after it belongs to 0.22.6.

changelog.json

@@ -1,9 +1,8 @@
 [
   {
-    "version": "0.22.5",
+    "version": "0.22.6",
     "date": "",
     "en": [
-      "Cluster filters gain NEW POTA and NEW COUNTY, alongside the existing status chips.",
       "A playback that fails to start now says so in the log instead of ending silently after a tenth of a second.",
       "Replaying a recording before the previous one has finished now works: the new playback waits for the audio device to be free instead of keying the radio and releasing at once.",
       "The play button becomes a stop button while the recording is going out: it cuts the transmission and releases the PTT, and you can send it again straight away.",
@@ -15,7 +14,6 @@
       "A quiet DX cluster no longer looks like a broken one: silence stopped counting as a disconnection, so a node with few spots keeps its session, its login and its filters."
     ],
     "fr": [
-      "Les filtres du cluster gagnent NEW POTA et NEW COUNTY, à côté des pastilles de statut existantes.",
       "Une lecture qui ne démarre pas le signale désormais dans le journal, au lieu de s'arrêter en silence au bout d'un dixième de seconde.",
       "Relancer un enregistrement avant la fin du précédent fonctionne désormais : la nouvelle lecture attend que le périphérique audio soit libre, au lieu de passer en émission et de relâcher aussitôt.",
       "Le bouton de lecture devient un bouton d'arrêt pendant l'émission de l'enregistrement : il coupe l'émission et relâche le PTT, et vous pouvez le renvoyer aussitôt.",
@@ -27,6 +25,16 @@
       "Un cluster calme ne passe plus pour un cluster mort : le silence ne compte plus comme une déconnexion, donc un nœud avec peu de spots garde sa session, son login et ses filtres."
     ]
   },
+  {
+    "version": "0.22.5",
+    "date": "",
+    "en": [
+      "Cluster filters gain NEW POTA and NEW COUNTY, alongside the existing status chips."
+    ],
+    "fr": [
+      "Les filtres du cluster gagnent NEW POTA et NEW COUNTY, à côté des pastilles de statut existantes."
+    ]
+  },
   {
     "version": "0.22.4",
     "date": "",