fix(sshd_config): drop obsolete comment (fixes #120)

[alxwr]

PR progress checklist (to be filled in by reviewers)

• [ ] Changes to documentation are appropriate (or tick if not required)
• [ ] Changes to tests are appropriate (or tick if not required)
• [ ] Reviews completed

---

What type of PR is this?

Primary type

• [ ] [build] Changes related to the build system
• [ ] [chore] Changes to the build process or auxiliary tools and libraries such as documentation generation
• [ ] [ci] Changes to the continuous integration configuration
• [ ] [feat] A new feature
• [x] [fix] A bug fix
• [ ] [perf] A code change that improves performance
• [ ] [refactor] A code change that neither fixes a bug nor adds a feature
• [ ] [revert] A change used to revert a previous commit
• [ ] [style] Changes that do not affect the meaning of the code (white-space, formatting, missing semi-colons, etc.)

Secondary type

• [ ] [docs] Documentation changes
• [ ] [test] Adding missing or correcting existing tests

Does this PR introduce a BREAKING CHANGE?

No.

Related issues and/or pull requests

https://github.com/saltstack-formulas/openssh-formula/issues/120

Describe the changes you're proposing

Remove a misleading comment.

Pillar / config required to test the proposed changes

–

Debug log showing how the proposed changes work

----------
          ID: sshd_config
    Function: file.managed
        Name: /etc/ssh/sshd_config
      Result: None
     Comment: The file /etc/ssh/sshd_config is set to be changed
              Note: No changes made, actual changes may
              be different due to other states.
     Started: 02:09:22.861195
    Duration: 150.767 ms
     Changes:   
              ----------
              diff:
                  --- 
                  +++ 
                  @@ -1,7 +1,4 @@
                   # This file is managed by salt. Manual changes are going to be overwritten.
                  -# The contents of the original sshd_config are kept on the bottom for
                  -# quick reference.
                  -# See the sshd_config(5) manpage for details

                   Port 22
                   Protocol 2
----------
          ID: openssh
    Function: service.running
        Name: sshd
      Result: None
     Comment: Service is set to be restarted
     Started: 02:09:23.132870
    Duration: 55.057 ms
     Changes:

Summary for host.domain.tld
-------------
Succeeded: 12 (unchanged=2, changed=1)
Failed:     0
-------------
Total states run:     12
Total run time:    2.959 s

Documentation checklist

• [ ] Updated the README (e.g. Available states).
• [ ] Updated pillar.example.

Testing checklist

• [ ] Included in Kitchen (i.e. under state_top).
• [ ] Covered by new/existing tests (e.g. InSpec, Serverspec, etc.).
• [ ] Updated the relevant test pillar.

Additional context