doc: Fix size of UUID Count value for Service Discovery
diff --git a/doc/mgmt-api.txt b/doc/mgmt-api.txt
index 3f593f9..8d07672 100644
--- a/doc/mgmt-api.txt
+++ b/doc/mgmt-api.txt
@@ -2264,7 +2264,7 @@
 	Controller Index:	<controller id>
 	Command Parameters:	Address_Type (1 Octet)
 				RSSI_Threshold (1 Octet)
-				UUID_Count (1 Octet)
+				UUID_Count (2 Octets)
 				UUID[i] (16 Octets)
 	Return Parameters:	Address_Type (1 Octet)