ChangeLog: fix docker hub URL

[victorabarros]

Hello people!

I'm studing about NSQ and noticed at Docker Page the link to docker image doesn't work. I came to repo and noticed the same at Changelog.
That is redirecting to https://registry.hub.docker.com/u/nsqio/nsq/ and the correct is https://registry.hub.docker.com/r/nsqio/nsq/ with com/r/nsqio/ on route.

This my little contribution, thanks for amazing product.

[ploxiln]

Thanks for pointing this out.

The page content for https://nsq.io/deployment/docker.html can be found/fixed in https://github.com/nsqio/nsqio.github.io

For this PR, can you just fix the typo in your git commit title? (hud -> hub)

[victorabarros]

Thanks for pointing this out.

The page content for https://nsq.io/deployment/docker.html can be found/fixed in https://github.com/nsqio/nsqio.github.io

For this PR, can you just fix the typo in your git commit title? (hud -> hub)

Commit name fixed. =)

[ploxiln]

... unfortunately this PR now contains both the wrong version and the right version, merged together. if you amend a commit (or rebase a branch) you have to force-push it, even though git's default help message says "cannot fast-forward, you should merge"

no biggie, I'll fix it