Plugin: Fix small typo in readme.txt file

[shail-mehta]

small typo correction in readme.txt file i think benefitting should be benefiting

[github-actions]

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Co-authored-by: shail-mehta <shailu25@git.wordpress.org>
Co-authored-by: Soean <soean@git.wordpress.org>
Co-authored-by: Mamaduka <mamaduka@git.wordpress.org>

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[Soean]

Benefiting is the spelling that is primarily used in American English. Benefitting is the spelling that is primarily used in British English.

We should use the American English, see https://make.wordpress.org/docs/handbook/documentation-team-handbook/handbooks-grammar-guide/