docs(date-time-format): update link to carbon-for-products page

[janhassel]

Updates the link to the "Date and time" guidance on the new Carbon for IBM Products website.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.19%. Comparing base (72617dd) to head (e6efdd6).
Report is 7 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #17692   +/-   ##
=======================================
  Coverage   77.19%   77.19%           
=======================================
  Files         409      409           
  Lines       14025    14025           
  Branches     4355     4307   -48     
=======================================
  Hits        10827    10827           
  Misses       3029     3029           
  Partials      169      169           

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[carbon-automation]

Hey there! v11.68.0 was just released that references this issue/PR.