Remove reference to the NuGet package (#20092)

Author: pranavkm

aspnetcore/host-and-deploy/proxy-load-balancer.md

@@ -32,7 +32,7 @@ By convention, proxies forward information in HTTP headers.
 | X-Forwarded-Proto | The value of the originating scheme (HTTP/HTTPS). The value may also be a list of schemes if the request has traversed multiple proxies. |
 | X-Forwarded-Host | The original value of the Host header field. Usually, proxies don't modify the Host header. See [Microsoft Security Advisory CVE-2018-0787](https://github.com/aspnet/Announcements/issues/295) for information on an elevation-of-privileges vulnerability that affects systems where the proxy doesn't validate or restrict Host headers to known good values. |
 
-The Forwarded Headers Middleware, from the [Microsoft.AspNetCore.HttpOverrides](https://www.nuget.org/packages/Microsoft.AspNetCore.HttpOverrides/) package, reads these headers and fills in the associated fields on <xref:Microsoft.AspNetCore.Http.HttpContext>.
+The Forwarded Headers Middleware (<xref:Microsoft.AspNetCore.HttpOverrides.ForwardedHeadersMiddleware>), reads these headers and fills in the associated fields on <xref:Microsoft.AspNetCore.Http.HttpContext>.
 
 The middleware updates: