github newrelic/docs-website release-03.16.2022-21.16

🚀 What's new?

@zuluecho9 - fix(original user): add about upgrade requests UI ->
@zuluecho9 - fix(api keys): adding note about capabilites ->
@zuluecho9 - fix(original user): adjust readability ->
@zuluecho9 - Merge pull request #6639 from newrelic/API-keys---add-about-key-capabilities ->
@zuluecho9 - Merge pull request #6636 from newrelic/v1-users-'upgrade-requests'-UI ->

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