Fix manpage emphasis

Signed-off-by: Ingo Becker <ingo@orgizm.net>

docs/source/markdown/podman-volume-create.1.md

@@ -22,7 +22,7 @@ There are two drivers supported by Podman itself: **local** and **image**.
 The **local** driver uses a directory on disk as the backend by default, but can also use the **mount(8)** command to mount a filesystem as the volume if **--opt** is specified.
 The **image** driver uses an image as the backing store of for the volume.
 An overlay filesystem will be created, which allows changes to the volume to be committed as a new layer on top of the image.
-Using a value other than **local or **image**, Podman will attempt to create the volume using a volume plugin with the given name.
+Using a value other than **local** or **image**, Podman will attempt to create the volume using a volume plugin with the given name.
 Such plugins must be defined in the **volume_plugins** section of the **[containers.conf(5)](https://github.com/containers/common/blob/main/docs/containers.conf.5.md)** configuration file.
 
 #### **--help**