Fix #392-Add a class to center columns text

[Victor-AcostaCNC]

Please always provide the GitHub issue(s) your PR is for, as well as test URLs where your change can be observed (before and after):

Fix ##392

Test URLs:

• Before: https://main--cn-website--netcentric.hlx.page/
• After: https://392-benefits-icons-bug--cn-website--netcentric.hlx.page/

to fix this issue the class columns-3-cols needs to be added in the column container. I added a text-center class to center the text beneath each icon.

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