Cleanup Newton release notes

There were a few formatting and wording issues with recent release
notes. Reworded a few descriptions and corrected missing structure that
would cause the HTML to not render correctly.

Change-Id: Ie406ee42cb10bd3a1e0fdbb1bb5ab618ef75b1e5

releasenotes/notes/delete-volume-metadata-keys-3e19694401e13d00.yaml

@@ -1,3 +1,4 @@
 ---
 features:
-  - Added using etags to avoid the lost update problem during deleting volume metadata.
+  - Added using etags in API calls to avoid the lost update problem during
+    deleting volume metadata.

releasenotes/notes/fix-hnas-stats-reporting-1335e582e46ff440.yaml

@@ -1,4 +1,4 @@
 ---
 fixes:
-  - Fixes HNAS stats reporting. HNAS driver was not correctly reporting THIN
+  - Fixed issue where the HNAS driver was not correctly reporting THIN
     provisioning and related stats.

releasenotes/notes/kaminario-cinder-driver-bug-1620781-821d16f5f7f2932f.yaml

@@ -1,6 +1,5 @@
 ---
 fixes:
-  - Fixed orphan view in "create_volume_from_snapshot" method
-    and multipath_devices in "create_volume_from_snapshot" and
-    "create_cloned_volume" methods in Kaminario iSCSI and FC Cinder Drivers.
+  - Fixed orphan view and multipath devices when creating a volume from a
+    snapshot or cloning in the Kaminario iSCSI and FC Cinder Drivers.
 

releasenotes/notes/live_migration_v3-ae98c0d00e64c954.yaml

@@ -1,3 +1,3 @@
 ---
 fixes:
-     Fix for live migration on VMAX3
+  - Fixed live migration on EMC VMAX3 backends.