Fix accenture study broken link in coaching handbook page

Why is this change being made?

This MR fixes a broken link in Coaching handbook page.

Broken link

https://talentorganizationblog.accenture.com/financialservices/the-importance-of-building-trust-in-the-financial-services-workplace-explained-in-6-eye-opening-statistics#:~:text=People%20at%20high%2Dtrust%20companies,106%25%20more%20energy%20at%20work

Context

Last valid Archive's Wayback Machine capture

Aug 6, 2020

https://web.archive.org/web/20200806015014/https://talentorganizationblog.accenture.com/financialservices/the-importance-of-building-trust-in-the-financial-services-workplace-explained-in-6-eye-opening-statistics

Correct/Updated link

https://bankingblog.accenture.com/the-importance-of-building-trust-in-the-financial-services-workplace-explained-in-6-eye-opening-statistics

Author Checklist

• Provided a concise title for this Merge Request (MR)
• Added a description to this MR explaining the reasons for the proposed change, per say why, not just what
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  • If the DRI for the page/s being updated isn’t immediately clear, then assign it to one of the people listed in the Maintained by section on the page being edited
  • If your manager does not have merge rights, please ask someone to merge it AFTER it has been approved by your manager in #mr-buddies
  • The when to get approval handbook section explains the workflow in more detail
• If the changes affect team members, or warrant an announcement in another way, please consider posting an update in #whats-happening-at-gitlab linking to this MR
  • If this change directly impacts most global team members, it should be a candidate for #company-fyi. Please work with internal communications and check the handbook for examples.

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