Fix typo in the 'Pirate metrics' abbreviation on Configure, Growth and Runner pages

Why is this change being made?

Sometimes we incorrectly abbreviate the Pirate metrics (Acquisition, Activation, Retention, Revenue, and Referral) as ARRR. The correct abbreviation should be AARRR. In this MR I propose a fix it on following pages:

• https://about.gitlab.com/handbook/engineering/development/ops/configure/#product-indicators
• https://about.gitlab.com/handbook/product/growth/
• https://about.gitlab.com/handbook/engineering/development/ci-cd/verify/runner/

Author Checklist

• Provided a concise title for the MR
• Added a description to this MR explaining the reasons for the proposed change, per [say-why-not-just-what][transparency]
• Assign this change to the correct DRI