doc: http metrics path normalization

[nelson-parente]

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Description

Related code link:

dapr/proposals#58

[github-actions[bot]]

Stale PR, paging all reviewers

[github-actions[bot]]

Stale PR, paging all reviewers

[github-actions[bot]]

Stale PR, paging all reviewers

[JoshVanL]

Please can we include in the documentation that there are security concerns with using the default high cardinality option whereby exposed Dapr enabled applications that call HTTP endpoints based on client input can cause unbounded cardinality in metrics resulting in DDoSing of the Dapr instance or cluster and/or larger metric ingestion bills.

[nelson-parente]

applied @hhunter-ms suggestions, ty! 👍