Remove prerelease (#25263)

Author: JoshLove-msft

sdk/schemaregistry/Azure.Data.SchemaRegistry/README.md

@@ -9,7 +9,7 @@ Azure Schema Registry is a schema repository service hosted by Azure Event Hubs,
 Install the Azure Schema Registry client library for .NET with [NuGet][nuget]:
 
 ```dotnetcli
-dotnet add package --prerelease Azure.Data.SchemaRegistry
+dotnet add package Azure.Data.SchemaRegistry
 ```
 
 ### Prerequisites