docs: check port install

CHANGELOG.md

@@ -62,6 +62,7 @@ In this release, the schema version has changed from 24 to 25.
 
 ### Fixed
 
+- Address already in use when trying to install on port 3000 ([#6099]).
 - Panic on using a single-slash filtering rule.
 - Panic on shutting down while DNS requests are in process of filtering
   ([#5948]).
@@ -69,6 +70,7 @@ In this release, the schema version has changed from 24 to 25.
 [#1453]: https://github.com/AdguardTeam/AdGuardHome/issues/1453
 [#5948]: https://github.com/AdguardTeam/AdGuardHome/issues/5948
 [#6053]: https://github.com/AdguardTeam/AdGuardHome/issues/6053
+[#6099]: https://github.com/AdguardTeam/AdGuardHome/issues/6099
 
 <!--
 NOTE: Add new changes ABOVE THIS COMMENT.

internal/home/controlinstall.go

@@ -402,13 +402,6 @@ func (web *webAPI) handleInstallConfigure(w http.ResponseWriter, r *http.Request
 		return
 	}
 
-	err = aghnet.CheckPort("tcp", netip.AddrPortFrom(req.DNS.IP, uint16(req.DNS.Port)))
-	if err != nil {
-		aghhttp.Error(r, w, http.StatusBadRequest, "%s", err)
-
-		return
-	}
-
 	curConfig := &configuration{}
 	copyInstallSettings(curConfig, config)