docs: update import statement in the GT.data_color() example

[jrycw]

I propose changing the import statement in the GT.data_color() example to follow a more commonly used pattern.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.37%. Comparing base (11660a6) to head (df6f377).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #432   +/-   ##
=======================================
  Coverage   86.37%   86.37%           
=======================================
  Files          42       42           
  Lines        4683     4683           
=======================================
  Hits         4045     4045           
  Misses        638      638           

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[rich-iannone]

Thank you!