replace 'durable reminders' by 'Actor reminders'

[alfred-mikhael]

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Description

Replaced "Retries are internally implemented using durable reminders" with "Retries are internally implemented using Actor reminders" in this article

Issue reference

Addresses issue #3805

[hhunter-ms]

lgtm

[msfussell]

@alfred-mikhael - Durable timers are internally backed by internal actor reminders - "There are no limits to the maximum duration of durable timers, which are internally backed by internal actor reminders."
So not sure this PR changes much, in that it is not currently wrong in the docs, it just refers to WF durable reminders, which are part of the durable reminders runtime.

[github-actions]

Stale PR, paging all reviewers

[hhunter-ms]

per @msfussell comment, I'm closing this PR. we can reopen if we find it necessary!