Update README for SignalR (#27749)
Update README for SignalR (#27749)

* Update README for SignalR

* fb

* Apply suggestions from code review

Co-authored-by: Stephen Halter <14c5c4fd52f930cfb84eb1882a56d9ac8231d823@gmail.com>

* Update README.md

Co-authored-by: Stephen Halter <14c5c4fd52f930cfb84eb1882a56d9ac8231d823@gmail.com>
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