scsi: be2iscsi: Add missing function parameter description

Also promote fully documented function header to kerneldoc.

Fixes the following W=1 kernel build warning(s):

drivers/scsi/be2iscsi/be_mgmt.c:112: warning: Function parameter or member 'phba' not described in 'mgmt_open_connection'

Link: https://lore.kernel.org/r/[e-mail]
Cc: Subbu Seetharaman <[e-mail]>
Cc: Ketan Mukadam <[e-mail]>
Cc: Jitendra Bhivare <[e-mail]>
Cc: [e-mail]
Signed-off-by: Lee Jones <[e-mail]>
Signed-off-by: Martin K. Petersen <[e-mail]>

drivers/scsi/be2iscsi/be_mgmt.c

···
 
 /**
  * mgmt_open_connection()- Establish a TCP CXN
+ * @phba: driver priv structure
  * @dst_addr: Destination Address
  * @beiscsi_ep: ptr to device endpoint struct
  * @nonemb_cmd: ptr to memory allocated for command
···
 	return tag;
 }
 
-/*
+/**
  * beiscsi_exec_nemb_cmd()- execute non-embedded MBX cmd
  * @phba: driver priv structure
  * @nonemb_cmd: DMA address of the MBX command to be issued