chore(unifi): Add docs for L3 adoption (#3715)

* chore(unifi): Add docs for L3 adoption

* re-wording

charts/stable/unifi/Chart.yaml

@@ -22,7 +22,7 @@ sources:
   - https://github.com/jacobalberty/unifi-docker
   - https://unifi-network.ui.com
 type: application
-version: 11.0.31
+version: 11.0.32
 annotations:
   truecharts.org/catagories: |
     - Networking

charts/stable/unifi/docs/how-to.md

@@ -0,0 +1,29 @@
+# How-To
+
+## L3 Adoption (DNS)
+
+One solution to solve problems when trying to adopt devices is to
+correctly configure your DNS server.
+
+By default all Unifi Devices try to resolve `unifi.localdomain`,
+to find the controller. Even adopted devices, uses this as a fallback.
+
+What you have to do is configure your DNS server, to resolve
+`unifi.localdomain` to the IP of your Unifi Controller. So the devices can find the
+controller.
+
+:::tip
+
+Replace `localdomain` with whatever domain you have on your LAN.
+
+:::
+
+:::caution
+
+This will only work if you use the default port (8080), on your Unifi controller
+
+:::
+
+For more information and solutions for L3 Adoption you can read this
+[article](https://help.ui.com/hc/en-us/articles/204909754-UniFi-Network-Layer-3-Adoption)
+on Unifi's website.

cspell.config.yaml

@@ -90,6 +90,7 @@ words:
   - loadbalancer
   - LOCALCNAMERECORDS
   - LOCALDNSRECORDS
+  - localdomain
   - logfile
   - loolwsd
   - mailenabled