Mount: add Alexmos to MNT2_TYPE param description

libraries/AP_Mount/AP_Mount.cpp

@@ -194,7 +194,7 @@ const AP_Param::GroupInfo AP_Mount::var_info[] PROGMEM = {
     // @Param: _TYPE
     // @DisplayName: Mount Type
     // @Description: Mount Type (None, Servo or MAVLink)
-    // @Values: 0:None, 1:Servo, 2:MAVLink 3:Alexmos Serial
+    // @Values: 0:None, 1:Servo, 2:MAVLink, 3:Alexmos Serial
     // @User: Standard
     AP_GROUPINFO("_TYPE", 19, AP_Mount, state[0]._type, 0),
 
@@ -377,7 +377,7 @@ const AP_Param::GroupInfo AP_Mount::var_info[] PROGMEM = {
     // @Param: 2_TYPE
     // @DisplayName: Mount2 Type
     // @Description: Mount Type (None, Servo or MAVLink)
-    // @Values: 0:None, 1:Servo, 2:MAVLink
+    // @Values: 0:None, 1:Servo, 2:MAVLink, 3:Alexmos Serial
     // @User: Standard
     AP_GROUPINFO("2_TYPE",           42, AP_Mount, state[1]._type, 0),
 #endif // AP_MOUNT_MAX_INSTANCES > 1