[Bug 274340] audio/mixertui: update package description

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=274340

            Bug ID: 274340
           Summary: audio/mixertui: update package description
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
               URL: https://gitlab.com/grahamperrin/freebsd-ports/-/merge_
                    requests/1
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: Individual Port(s)
          Assignee: ports-bugs@FreeBSD.org
          Reporter: grahamperrin@gmail.com

Lowercase hdmi caught my eye, a few other changes are suggested. 

For consideration by the maintainer: the merge request in GitLab.
Comments/reversion welcome. 

Patch file (from the MR): 
<https://gitlab.com/grahamperrin/freebsd-ports/-/merge_requests/1.patch>

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