Fix team member yaml files LinkedIn ('i', 'j', 'k')

Why is this change being made?

For some GitLab Inc. team members, the LinkedIn URL is rendered incorrectly at https://about.gitlab.com/company/team/.

(Copied from #13191 (closed)) For example, the LinkedIn URL of Ben Cowdry is rendered as https://www.linkedin.com/in/https://www.linkedin.com/in/bencowdry instead of https://www.linkedin.com/in/bencowdry. The "data yaml" of Ben Cowdry contains the full LinkedIn URL in property linkedin.

This MR updates related yaml files starting with letters 'i', 'j', and 'k', located at data/team_members/person/i, data/team_members/person/j, and data/team_members/person/k. It reduces property linkedin to contain the LinkedIn URL fragment after /in/.

Author Checklist

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• 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 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 is a change that directly impacts the majority of 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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Part of a series of MRs to close #13191 (closed)