chore: keep the re-landed feature files showroom-safe

The conversion / link / sheet commits predate the tree cleanup, so their
comments and README/test examples still carried internal refs. Re-apply
the genericization (no internal hosts, personal names or client file ids).

auth.go

@@ -103,10 +103,10 @@ func (c *Client) authenticateOnce(ctx context.Context) error {
 // token, and the portal error otherwise.
 //
 // OnlyOffice accepts either the userName or the account email as the login. On
-// the arc-1 portal (office.produktor.io) the account userName login returns
-// HTTP 500 "User authentication failed" while the account email succeeds —
-// confirmed for a freshly created guest user. Use this probe before sharing
-// credentials (see `oo users check`), and prefer the email as the login.
+// some portals the account userName login returns HTTP 500 "User authentication
+// failed" while the account email succeeds — confirmed for a freshly created
+// guest user. Use this probe before sharing credentials (see `oo users check`),
+// and prefer the email as the login.
 func (c *Client) AuthenticateAs(ctx context.Context, login, password string) error {
 	body, err := json.Marshal(Credentials{User: login, Password: password})
 	if err != nil {