scsi: docs: convert link_power_management_policy.txt to ReST

Link: https://lore.kernel.org/r/c56177[e-mail]
Signed-off-by: Mauro Carvalho Chehab <[e-mail]>
Signed-off-by: Martin K. Petersen <[e-mail]>

Documentation/scsi/index.rst

···
    hpsa
    hptiop
    libsas
+   link_power_management_policy
 
    scsi_transport_srp/figures

Documentation/scsi/link_power_management_policy.txt Documentation/scsi/link_power_management_policy.rst

···
+.. SPDX-License-Identifier: GPL-2.0
+
+==========================
+Link Power Managent Policy
+==========================
+
 This parameter allows the user to set the link (interface) power management.
 There are 3 possible options:
 
+=====================   =====================================================
 Value			Effect
-----------------------------------------------------------------------------
+=====================   =====================================================
 min_power		Tell the controller to try to make the link use the
 			least possible power when possible.  This may
 			sacrifice some performance due to increased latency
···
 medium_power		Tell the controller to enter a lower power state
 			when possible, but do not enter the lowest power
 			state, thus improving latency over min_power setting.
-
-
+=====================   =====================================================