update cpld command works with Unit index.

Hi.

Is there a reason why Dell suggests to execute cpld updates using a serial connection if this command works with Unit Indexes?. Example:

SWCORE_10_MAO#show version 1

SOC Version....................... BCM56340_A0
HW Version........................ 5
CPLD Version...................... 20
Boot Version...................... Not Available

unit active      backup      current-active next-active
---- ----------- ----------- -------------- --------------
1    6.5.3.6     6.3.1.8     6.5.3.6        6.5.3.6


SWCORE_10_MAO#show version 2

SOC Version....................... BCM56340_A0
HW Version........................ 5
CPLD Version...................... 13
Boot Version...................... Not Available

unit active      backup      current-active next-active
---- ----------- ----------- -------------- --------------
2    6.5.3.6     6.3.1.8     6.5.3.6        6.5.3.6


SWCORE_10_MAO#update cpld 2
This operation will reset the switch on completion. Are you sure you would like to update the CPLD? (y/n) y


Management switch has unsaved changes.
Would you like to save the changes? (y/n).y
Configuration Saved!

Issuing CPLD update command...

After the update:

SWCORE_10_MAO#show version

Machine Description............... Dell EMC Networking Switch
System Model ID................... N3048P
Machine Type...................... Dell EMC Networking N3048P
Serial Number..................... CN0FKJ362829862M0496A05
Manufacturer...................... 0xbc00
Burned In MAC Address............. F8B1.566F.0871
System Object ID.................. 1.3.6.1.4.1.674.10895.3060
SOC Version....................... BCM56340_A0
HW Version........................ 5
CPLD Version...................... 20
Image File........................ N3000AdvLitev6.5.3.6
Software Capability............... Stack Limit = 8, VLAN Limit = 1024

unit active      backup      current-active next-active
---- ----------- ----------- -------------- --------------
1    6.5.3.6     6.3.1.8     6.5.3.6        6.5.3.6
2    6.5.3.6     6.3.1.8     6.5.3.6        6.5.3.6

Why this information seems to be "secret", that you can update one cpld at the time using unit indexes? It's not the first time i'm doing this, and it seems to work fine inside 6.3 and 6.5 versions of this firmware.