Correct formatting in release note
A missing '_' is causing a hyperlink to render incorrectly in HTML.
---
fixes:
- |
- `Bug #1875570 <https://bugs.launchpad.net/cinder/+bug/1875570>`:
+ `Bug #1875570 <https://bugs.launchpad.net/cinder/+bug/1875570>`_:
Fixed issue with NFS backend where the image-volume cache was
never used to create a volume, even when the cache was enabled.
