Adds help text for `Notify Channel` option

src/components/notifications/Slack.vue

@@ -29,5 +29,8 @@
             <input id="slack-channel-notify" v-model="$parent.notification.slackchannelnotify" type="checkbox" class="form-check-input">
             <label for="slack-channel-notify" class="form-label">{{ $t("Notify Channel") }}</label>
         </div>
+        <div class="form-text">
+            {{ $t("aboutNotifyChannel") }}
+        </div>
     </div>
 </template>

src/lang/en.json

@@ -626,6 +626,7 @@
     "matrixDesc2": "It is highly recommended you create a new user and do not use your own Matrix user's access token as it will allow full access to your account and all the rooms you joined. Instead, create a new user and only invite it to the room that you want to receive the notification in. You can get the access token by running {0}",
     "Channel Name": "Channel Name",
     "Notify Channel": "Notify Channel",
+    "aboutNotifyChannel": "Notify channel will trigger a desktop or mobile notification for all members of the channel, whether their availability is set to active or away.",
     "Uptime Kuma URL": "Uptime Kuma URL",
     "Icon Emoji": "Icon Emoji",
     "signalImportant": "IMPORTANT: You cannot mix groups and numbers in recipients!",