Fix incorrect API name in dashboard documentation: AddOrleansDashboard → AddDashboard

[Copilot]

Dashboard documentation referenced the obsolete AddOrleansDashboard API. The public API for both ISiloBuilder and IClientBuilder is now AddDashboard.

Changes

• Updated playground/DashboardSeparateHost/README.md (2 occurrences)
• Updated src/Dashboard/Orleans.Dashboard/README.md (1 occurrence)

Example

// Before (incorrect)
clientBuilder.AddOrleansDashboard();

// After (correct)
clientBuilder.AddDashboard();

Note: The internal AddOrleansDashboardForSiloCore method remains unchanged - it's an implementation detail, not part of the public API surface.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Incorrect API name in READMEs/docs: AddOrleansDashboard is now AddDashboard</issue_title>
<issue_description>As the title says, ISiloBuilder/IClientBuidler do not have an AddOrleansDashboard API, it's now known as AddDashboard. Update READMEs and other strings where the incorrect API name appears.</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Incorrect API name in READMEs/docs: AddOrleansDashboard is now AddDashboard #9893

---

✨ Let Copilot coding agent set things up for you — coding agent works faster and does higher quality work when set up for your repo.

Microsoft Reviewers: Open in CodeFlow

[Copilot]

Pull request overview

This PR fixes incorrect API documentation by updating references from the obsolete AddOrleansDashboard to the current public API AddDashboard in dashboard-related README files.

Changes:

• Updated documentation to use the correct AddDashboard API method name for both ISiloBuilder and IClientBuilder

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
src/Dashboard/Orleans.Dashboard/README.md	Updated client builder example to use AddDashboard() instead of obsolete AddOrleansDashboard()
playground/DashboardSeparateHost/README.md	Updated two code examples to use AddDashboard() instead of obsolete AddOrleansDashboard()