wireless-regdb: re-add source url and info for CU

Handy to find modifications or new rules.

Cc: José Daniel Rodríguez <josedanielr@yandex.com>
Cc: Seth Forshee <seth.forshee@canonical.com>
Cc: WIRELESS ML <linux-wireless@vger.kernel.org>
Cc: REGDB ML <wireless-regdb@lists.infradead.org>
Signed-off-by: Xose Vazquez Perez <xose.vazquez@gmail.com>
Signed-off-by: Seth Forshee <seth.forshee@canonical.com>
diff --git a/db.txt b/db.txt
index b0d6689..ddf9e14 100644
--- a/db.txt
+++ b/db.txt
@@ -372,6 +372,9 @@
 	(5735 - 5835 @ 20), (30)
 
 # Source:
+# https://www.mincom.gob.cu/es/marco-legal
+# - Redes Informáticas
+#    Resolución 98- 2019 Reglamento de Redes Inalámbricas:
 # https://www.mincom.gob.cu/sites/default/files/marcoregulatorio/r_98-19_reglamento_redes_inalambricas.pdf
 country CU: DFS-FCC
 	(2400 - 2483.5 @ 40), (200 mW)