Add link to exemplars to specification/metrics/README.md

[davix]

Add doc link to exemplars

Fixes #

Changes

Please provide a brief description of the changes here.

For non-trivial changes, follow the change proposal process.

• Related issues #
• Related OTEP(s) #
• Links to the prototypes (when adding or changing features)
• CHANGELOG.md file updated for non-trivial changes
• spec-compliance-matrix.md updated if necessary

[linux-foundation-easycla]

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[cijothomas]

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[github-actions]

This PR was marked stale due to lack of activity. It will be closed in 7 days.