Fix restart apparmor command in unbound.md

[gregbrant2]

What does this PR aim to accomplish?:

Fixes an error in the Unbound DNS guide which says to restart unbound instead of apparmor.

How does this PR accomplish the above?:

Fixes the typo.

Link documentation PRs if any are needed to support this PR:

N/A

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[DL6ER]

We have sudo apparmor_parser -r /etc/apparmor.d/usr.sbin.unbound immediately preceding which loads (-r = replace) the change into the Linux kernel. The following restart is targeted at unbound as it has to be restarted to be allowed to write to this file afterwards.

I don't think this is a mistake.

[gregbrant2]

@DL6ER ah, ok. But then is the sudo service unbound restart on line 273 unnecessary? This is what made me think it's a typo as you're saying to restart unbound twice.

[dschaper]

Yeah, the unbound service call seems to have been inadvertently duplicated. This is the commit that added the apparmor instructions and I think that's where the code was duplicated. @DL6ER This was yours so I'll let you confirm or deny.

567d813

My suggestion is to remove the line that this PR changes. Leave the unbound restart in the section directly below.