Update text for strict funnel setting (#6241)

The toggle wording could be confusing for some people.

"Allow other steps between funnel steps" as the first "steps" used in the sentence could seem like *are there other funnel steps I need to configure?*

So updated it to "Allow other activity in between funnel steps" instead.

Author: Hricha-Shandily

extra/lib/plausible_web/live/funnel_settings/form.ex

@@ -82,7 +82,7 @@ defmodule PlausibleWeb.Live.FunnelSettings.Form do
 
             <div class="mt-6 flex items-center justify-between gap-4">
               <span class="text-sm font-medium text-gray-900 dark:text-gray-100">
-                Allow other steps between funnel steps
+                Allow other activity between funnel steps
               </span>
               <div class="flex items-center gap-3">
                 <.toggle_switch