Docs need example for cleaning up Docker images

In NEXUS-18067 , support for creating a Cleanup Policy which can delete via a regular expression was added.
On this page:

https://help.sonatype.com/repomanager3/cleanup-policies

we should add some example regular expressions for cleaning up docker images.

I did some trial and error, and found that if I have an docker image
with a name of mycompany/my-image and tag 3.0.0.0-f79983f-dev then I can create cleanup policy with Asset Name Matcher this regexp:

v2/mycompany/my-image/manifests/.-dev*

I also was able to use regexp's like this:

v2/mycompany/my-image/manifests/([4-9]|[a-f])([4-9]|[a-f])([4-9]|[a-f])([4-9]|[a-f])([4-9]|[a-f])([4-9]|[a-f])([4-9]|[a-f])
v2/mycompany/my-image/manifests/([0-9]|[a-f])([0-9]|[a-f])*

blah