Compare views: start with a view the zone is linked to

The tab picked the first other view in view order, so a zone linked with
one view opened compared with an unrelated one.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

docs/views.md

@@ -235,7 +235,10 @@ before it).
 ## Comparing views
 
 A zone's **Compare views** tab, or `jarl zone diff`, compares it with the
-same zone in another view (or all of them), from the view you're on:
+same zone in another view (or all of them), from the view you're on.
+The tab starts with a view the zone is linked to, if any, else the
+first other view; `jarl zone diff` compares with every other view unless
+`--with` names some:
 
 ```
 $ jarl zone diff adbraun.lol --view internal