Update file buyer-persona.md to fix typos in Compliance Cooper section

Why is this change being made?

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Please add the details saying why, not just what in this section. Example: We have discussed the topic in Slack - (copy of Slack conversation). The current process is not efficient, this MR makes the description of X more clear, and helps move Y forward.

As part of the 100 day onboarding for product managers at GitLab, I read up on the buyer persona profiles that are relevant to my group. However, when reading the 'Compliance Cooper' section, I realised that there were some typos and mispellings that needed to be fixed.

This MR fixes the following sentence:

Vulternability and Dependcy manageemnt are easier through SBOM creationg, license approvals policies, and security dashboards

to

Vulnerability and Dependency management are easier through SBOM creation, licence approvals policies, and security dashboards

Author and Reviewer Checklist

Please verify the check list and ensure to tick them off before the MR is merged.

• 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
  • Copy/paste the Slack conversation to document it for later, or upload screenshots. Verify that no confidential data is added, and the content is SAFE
• Assign reviewers for this MR to the correct Directly Responsible Individual/s (DRI)
  • 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
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  • The when to get approval handbook section explains the workflow in more detail
• For transparency, share this MR with the audience that will be impacted.
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Commits

• Update file buyer-persona.md

• Update file buyer-persona.md

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