Fix pep8 issues in driver docs

I noticed these pep8 failures that are unrelated to my patch

...block-storage/drivers/dell-emc-vnx-driver.rst:1083: D001 Line too long
...block-storage/drivers/hpe-3par-driver.rst:348: D001 Line too long

Patch: https://review.opendev.org/c/openstack/cinder/+/823089
Job: https://storage.gra.cloud.ovh.net/v1/AUTH_dcaab5e32b234d56b626f72581e3644c/zuul_opendev_logs_824/823089/8/check/openstack-tox-pep8/824f11a/job-output.txt

Looks no harm in fixing them.

Change-Id: I6b0186740540bab728f9e0874de4defa4c42fec8

doc/source/configuration/block-storage/drivers/dell-emc-vnx-driver.rst

@@ -1080,9 +1080,9 @@ The steps mentioned below are for the compute nodes. Follow the
 same steps for the Block Storage nodes also (The steps can be skipped if
 initiator auto registration is enabled).
 
-#. On the compute node with IP address ``10.10.61.1`` and host name ``myhost1``,
-   execute the following commands (assuming ``10.10.61.35`` is the iSCSI
-   target):
+#. On the compute node with IP address ``10.10.61.1`` and host name
+   ``myhost1``, execute the following commands (assuming ``10.10.61.35`` is
+   the iSCSI target):
 
    #. Start the iSCSI initiator service on the node:
 

doc/source/configuration/block-storage/drivers/hpe-3par-driver.rst

@@ -345,7 +345,8 @@ OpenStack software.
       other options run the :command:`setwsapi -h` command.
 
 #. If you are not using an existing CPG, create a CPG on the HPE 3PAR / Primera
-   / Alletra 9k storage system to be used as the default location for creating volumes.
+   / Alletra 9k storage system to be used as the default location for creating
+   volumes.
 
 #. Make the following changes in the ``/etc/cinder/cinder.conf`` file.