Add steps for fixing unbound on bullseye

[jaredmo]

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• What does this PR aim to accomplish?:

Added steps to fix unbound for Bullseye installations where unbound-resolvconf.service has already created /etc/unbound/unbound.conf.d/resolvconf_resolvers.conf

• How does this PR accomplish the above?:

Added steps and changed header description.

• What documentation changes (if any) are needed to support this PR?:

This is a doc change, so no additional changes required.

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[dschaper]

This is the test fail message:

markdownlint-cli2 v0.4.0 (markdownlint v0.25.1)
Finding: **/*.md !**/node_modules/**
Linting: 81 file(s)
Summary: 1 error(s)
docs/guides/dns/unbound.md:237 MD031/blanks-around-fences Fenced code blocks should be surrounded by blank lines [Context: "```bash"]
Error: Process completed with exit code 1.

[jaredmo]

Thanks! I fixed it in the second commit.

[dschaper]

Thank you! I don't have a way to test this myself. @yubiuser or @jfb-pihole does this follow what your suggestions have been when troubleshooting?

[jaredmo]

This is where I found the solution if that is helpful. It fixed my issues. https://discourse.pi-hole.net/t/running-pi-hole-on-bullseye-with-unbound-resolvconf-file-appears-after-reboot/52814

[yubiuser]

Thanks for your contribution. This is a long-lasting open issue we wanted to address at some point.

The instructions are exactly what we use as quick troubleshooting help on discourse. However, I'm not sure how unbound-resolvconf.service relates to the changes in seen with resolvconf_resolver.conf in bullseye and if this should all be in one paragraph. I know that @jfb-pihole wanted to write a guide too. I'm sure he will review this PR when time permits.

[DL6ER]

@yubiuser @jfb-pihole Almost one year later I'm going to ping you about the status of this PR. Otherwise, I'm fine with merging it as is.

[github-actions[bot]]

This pull request has conflicts, please resolve those before we can evaluate the pull request.

[yubiuser]

Superseded by https://github.com/pi-hole/docs/pull/834 and https://github.com/pi-hole/docs/pull/859