STYLE: Prefer using "Copyright" over the symbol in file headers

[jhlegarreta]

Prefer using "Copyright" over the symbol in file headers.

[jhlegarreta]

Not sure if this is a consequence of the IDE formatting capabilities when C&Ping. Else, if the symbol is preferred, then I'll change the rest of the files and the NOTICE in the repository root.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 66.18%. Comparing base (796c501) to head (da7c4fe).
Report is 11 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #246   +/-   ##
=======================================
  Coverage   66.18%   66.18%           
=======================================
  Files          19       19           
  Lines         905      905           
  Branches      112      112           
=======================================
  Hits          599      599           
  Misses        264      264           
  Partials       42       42           

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[oesteban]

It's okay either way. Let's start with what is the standard now.