Docs: fix test references in Metrics utility #5266
Description
What were you searching in the docs?
The PR #5160 moved the location of some of the test files and broke some links, we need to fix that.
Is this related to an existing documentation section?
https://docs.powertools.aws.dev/lambda/python/latest/core/metrics/
How can we improve?
Fix the links
Got a suggestion in mind?
No response
Acknowledgment
- I understand the final update might be different from my proposed suggestion, or refused.