tidy-up code and leave comment in /edit/archive about Meilisearch.

This defroute doesn't change anything relevant in the Meilisearch DB so it
doesn't need updating. I've left a comment (mostly for future me) to remind me
not to think I've missed a defroute and try to integrate the Meilisearch stuff
into it.

src/web.lisp

@@ -1309,11 +1309,13 @@
 	      (:logged-in)
 	      ;; Authorised
 	      (cond ((utils:string-is-nil-or-empty? slug)
-		     (utils:set-alert "Archive entry cannot be found."
-				      "missing-data")
+		     (utils:set-alert
+                      "Archive entry cannot be found." "missing-data")
 		     (redirect "/user/archive"))
-		     
 		    (t (storage:store-text "" "archive" slug page-content)
+                       ;; Meilisearch integration not needed here because
+                       ;; nothing has changed from the Meilisearch DB
+                       ;; perspective.
 		       (utils:set-alert "Archive entry updated." "success")
 		       (redirect (format nil "/edit/archive/~a" slug))))
 	      ;; Not Authorised