docs: fix description of argocd_oci_request_duration_seconds metric

[Piyushkhobragade]

This PR fixes a documentation inconsistency in the metrics reference.

argocd_oci_request_duration_seconds is defined as a histogram and represents request latency, but the documentation previously described it as a failure count. Failure-related metrics already exist as *_fail_total.

This change updates the description to accurately reflect the metric semantics.

Fixes #25912

[bunnyshell]

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[Piyushkhobragade]

/dco

[blakepettersson]

@Piyushkhobragade you need to do

git commit --amend -s && git push -f

[blakepettersson]

Thanks!