Update path of Admin > Settings > Usage statistics

What does this MR do?

Documentation page: https://docs.gitlab.com/ee/user/admin_area/settings/usage_statistics.html

The path to the setting is not consistent (there are a total of 3 references to this path).

It should be Admin area > Settings > Metrics and profiling > Usage statistics instead of Admin area > Settings > Usage statistics

Screenshots

Related issues

Author's checklist

• Follow the Documentation Guidelines and Style Guide.
• If applicable, update the permissions table.
• Link docs to and from the higher-level index page, plus other related docs where helpful.
• Apply the documentation label.

Review checklist

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1. Primary Reviewer

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3. Maintainer

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