[bug #60305] chem(1) links to long-gone http://cm.bell-labs.com/ URL

[G. Branden Robinson]

Update of bug #60305 (project groff):

                Category:                    Core => Preprocessor -
others/general
                  Status:               Need Info => Fixed                  
             Open/Closed:                    Open => Closed                 
         Planned Release:                    None => 1.23.0                 
                 Summary: chem(1) still links to long-gone
http://cm.bell-labs.com/ => chem(1) links to long-gone
http://cm.bell-labs.com/ URL

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Follow-up Comment #6:

The discussion (with its scope broadened at my prompting) didn't really seem
to lead anywhere definitive.  In the past year or two I've groped in the
direction of documenting URLs as "historical" in a few cases, but the number
has been so few that it might be exaggerating to call it a trend.

For now, I'd like to state a rule that we shouldn't have broken URLs in man
page text unless they are annotated as "historical".  This way a user is
prompted to use the Wayback Machine of the Internet Archive or whatever other
resource they have access to at the time they read it.

Resolving.  There's no ChangeLog entry and no bug-closer because as noted in
comment #1, the URL was already dropped from groff Git by the time the ticket
was files.


commit 83326197dce94750d5cb71a4c84402bdb2f3b558
Author: G. Branden Robinson <g.branden.robinson@gmail.com>
Date:   Sun Sep 6 05:48:04 2020 +1000

    chem(1): Remove dead links.
    
    Also expand and cocommit 83326197dce94750d5cb71a4c84402bdb2f3b558
Author: G. Branden Robinson <g.branden.robinson@gmail.com>
Date:   Sun Sep 6 05:48:04 2020 +1000

    chem(1): Remove dead links.
    
    Also expand and correct bibliographic and source references.



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