Update PlaywrightMcp.md: update path to SSE endpoint

[akloeber]

Motivation and Context

Append /sse to Playwright MCP server path as latest Playwright versions (e.g. 0.0.44) expose legacy SSE transport support at this path.

❯ npx --yes @playwright/mcp@latest --port 8931
Listening on http://localhost:8931
Put this in your client config:
{
  "mcpServers": {
    "playwright": {
      "url": "http://localhost:8931/mcp"
    }
  }
}
For legacy SSE transport support, you can use the /sse endpoint instead.

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Type of the changes

• [ ] New feature (non-breaking change which adds functionality)
• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)
• [x] Documentation update
• [ ] Tests improvement
• [ ] Refactoring

Checklist

• [X] The pull request has a description of the proposed change
• [x] I read the Contributing Guidelines before opening the pull request
• [x] The pull request uses develop as the base branch
• [ ] Tests for the changes have been added
• [ ] All new and existing tests passed

Additional steps for pull requests adding a new feature

• [ ] An issue describing the proposed change exists
• [ ] The pull request includes a link to the issue
• [ ] The change was discussed and approved in the issue
• [ ] Docs have been added / updated