scsi: docs: Organize the SCSI documentation

Break the SCSI documentation up into categories:

  Introduction, APIs, driver parameters, and host adapter drivers instead
  of alphabetical by document file name (i.e., no organization).

Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Link: https://lore.kernel.org/r/20230518212749.18266-2-rdunlap@infradead.org
Cc: "James E.J. Bottomley" <jejb@linux.ibm.com>
Cc: "Martin K. Petersen" <martin.petersen@oracle.com>
Cc: linux-scsi@vger.kernel.org
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: linux-doc@vger.kernel.org
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

Documentation/scsi/index.rst

@@ -4,6 +4,38 @@
 SCSI Subsystem
 ==============
 
+.. toctree::
+   :maxdepth: 1
+
+Introduction
+============
+
+.. toctree::
+   :maxdepth: 1
+
+   scsi
+
+SCSI driver APIs
+================
+
+.. toctree::
+   :maxdepth: 1
+
+   scsi_mid_low_api
+   scsi_eh
+
+SCSI driver parameters
+======================
+
+.. toctree::
+   :maxdepth: 1
+
+   scsi-parameters
+   link_power_management_policy
+
+SCSI host adapter drivers
+=========================
+
 .. toctree::
    :maxdepth: 1
 
@@ -25,7 +57,6 @@ SCSI Subsystem
    hpsa
    hptiop
    libsas
-   link_power_management_policy
    lpfc
    megaraid
    ncr53c8xx
@@ -33,12 +64,8 @@ SCSI Subsystem
    ppa
    qlogicfas
    scsi-changer
-   scsi_eh
    scsi_fc_transport
    scsi-generic
-   scsi_mid_low_api
-   scsi-parameters
-   scsi
    sd-parameters
    smartpqi
    st