docs(browser): add “Clear cached credentials now” how-to #2611
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This adds a short step-by-step to the Browser credentials handling page so users can immediately clear cached credentials without waiting for timeouts. It’s based on existing behavior documented on the page (:server disconnect clears credentials; caching can be disabled with browser.retain_connection_credentials=false).
Page: Operations Manual → Security → Browser credentials handling
Rationale: improves task-oriented guidance and reduces user confusion after changing auth settings.