Update site/content/how-to/traffic-management/request-response-headers.md

Co-authored-by: Alan Dooley <[email protected]>

Author: salonichf5

site/content/how-to/traffic-management/request-response-headers.md

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 ## RequestHeaderModifier example
 
 This examples demonstrates how to configure traffic routing for a simple echo server. A HTTPRoute resource is used to route traffic to the headers application, using the `RequestHeaderModifier` filter to modify headers in the request. You can then verify that the server responds with the modified request headers.